// ==UserScript==
// @name         X阅读模式
// @namespace    https://scriptcat.org/scripts/code/7614/X阅读模式.user.js
// @version      1.3.9
// @description  小说漫画阅读增强工具：自动进入纯净阅读模式，滚动加载下一章，支持目录选章、字号/行距/主题调节、点击翻页。支持批量下载章节为TXT，分页失败自动重试并备注，停止后已下载章节完整保留。当前网站自动加入白名单并拦截无关跳转，自动保存阅读进度，支持净化词过滤正文，油猴菜单可一键导出诊断日志。
// @author       失辛向南
// @license      MIT
// @match        *://*/*
// @run-at       document-end
// @noframes
// @require      https://cdnjs.cloudflare.com/ajax/libs/readability/0.4.1/Readability.min.js
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @grant        GM_xmlhttpRequest
// @connect      *
// ==/UserScript==

(function () {
  'use strict';
  if (window.top !== window.self) return;

  /* ==================== 诊断日志系统 ==================== */
  var __diag = (function () {
    var MAX = 800;
    var lines = [];
    var scriptName = 'X阅读模式';
    var version = '1.3.4';
    function nowStr() {
      try { return new Date().toLocaleString('zh-CN', { hour12: false }); } catch (e) { return new Date().toString(); }
    }
    function safeStr(o) {
      try {
        if (o instanceof Error) return o.name + ': ' + o.message + (o.stack ? '\n' + o.stack.split('\n').slice(0, 6).join('\n') : '');
        if (typeof o === 'string') return o;
        return JSON.stringify(o);
      } catch (e) { return String(o); }
    }
    function push(level, msg) {
      try {
        var s = safeStr(msg);
        if (s.length > 600) s = s.slice(0, 600) + '…';
        lines.push('[' + nowStr() + '][' + level + '] ' + s);
        if (lines.length > MAX) lines.shift();
      } catch (e) {}
    }
    function wrapConsole() {
      ['log', 'info', 'warn', 'error', 'debug'].forEach(function (m) {
        var orig = console[m];
        if (typeof orig !== 'function') return;
        try {
          console[m] = function () {
            try {
              var args = Array.prototype.slice.call(arguments);
              var text = args.map(function (a) { return typeof a === 'string' ? a : safeStr(a); }).join(' ');
              if (m === 'error' || m === 'warn') push(m.toUpperCase(), text);
              else if (text.charAt(0) === '[') push(m.toUpperCase(), text);
            } catch (e) {}
            return orig.apply(console, arguments);
          };
        } catch (e) {}
      });
    }
    function hookErrors() {
      window.addEventListener('error', function (ev) {
        try {
          // 资源加载失败（img/script/link 等）：单独记录具体资源 URL
          var t = ev.target;
          if (t && t.tagName && !(ev.message)) {
            var src = t.src || t.currentSrc || t.href || '';
            push('ERROR', '资源加载失败: <' + String(t.tagName).toLowerCase() + '> ' + (src || '(无URL)'));
            return;
          }
          var msg = ev.message || '';
          var loc = ((ev.filename || '') + ':' + (ev.lineno || '') + ':' + (ev.colno || '')).replace(/^::/, '');
          if (ev.error && ev.error.message) msg = ev.error.message;
          // 过滤无 message、无位置、无 error 对象的空错误事件（多为扩展/无关资源注入，无排障价值）
          if (!msg && !loc && !ev.error) return;
          var extra = '';
          if (ev.error && ev.error.stack) {
            extra = '\n' + ev.error.stack.split('\n').slice(0, 5).join('\n');
          }
          push('ERROR', 'window.onerror: ' + msg + ' @ ' + loc + extra);
        } catch (e2) {}
      }, true);
      window.addEventListener('unhandledrejection', function (ev) {
        var r = ev.reason;
        push('ERROR', 'unhandledrejection: ' + (r && r.message ? r.message : safeStr(r)));
      });
    }
    function buildReport() {
      var out = [];
      out.push('========== ' + scriptName + ' 诊断日志 ==========');
      out.push('版本: ' + version);
      out.push('生成时间: ' + nowStr());
      out.push('页面: ' + location.href);
      out.push('UA: ' + navigator.userAgent);
      out.push('视口: ' + (window.innerWidth || '') + 'x' + (window.innerHeight || ''));
      try {
        out.push('白名单数量: ' + getWhitelist().length);
        out.push('历史记录数量: ' + getHistory().length);
        try { out.push('目录缓存数量: ' + Object.keys(getTocCacheAll()).length); } catch (eTc) {}
        var st = getSettings();
        out.push('设置: ' + (st ? safeStr(st) : '(默认)'));
      } catch (e) { out.push('存储状态读取失败: ' + safeStr(e)); }
      out.push('-------- 日志记录 (' + lines.length + ' 条) --------');
      for (var i = 0; i < lines.length; i++) out.push(lines[i]);
      return out.join('\n');
    }
    function download() {
      try {
        var text = buildReport();
        var blob = new Blob([text], { type: 'text/plain;charset=utf-8' });
        var url = URL.createObjectURL(blob);
        var a = document.createElement('a');
        a.href = url;
        var d = new Date(), pad = function (n) { return n < 10 ? '0' + n : '' + n; };
        a.download = scriptName + '-诊断日志-' + d.getFullYear() + pad(d.getMonth() + 1) + pad(d.getDate()) + '-' + pad(d.getHours()) + pad(d.getMinutes()) + pad(d.getSeconds()) + '.txt';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        setTimeout(function () { try { URL.revokeObjectURL(url); } catch (e2) {} }, 5000);
        return true;
      } catch (e) {
        try { prompt('无法自动下载日志，请复制以下内容：', buildReport()); } catch (e2) {}
        return false;
      }
    }
    wrapConsole();
    hookErrors();
    return { push: push, download: download, buildReport: buildReport, info: function (m) { push('INFO', m); }, warn: function (m) { push('WARN', m); }, error: function (m) { push('ERROR', m); } };
  })();
  __diag.info('脚本已加载，版本 ' + '1.3.1');

  /* ==================== 常量与状态 ==================== */
  var KEY_SETTINGS = 'novel_reader_settings_v1';
  var KEY_WHITELIST = 'novel_reader_whitelist_v1';
  var KEY_HISTORY = 'novel_reader_history_v1';
  var KEY_PURIFY = 'novel_reader_purify_v1';
  var KEY_TOC_CACHE = 'novel_reader_toc_cache_v1';
  var TOC_CACHE_TTL = 24 * 60 * 60 * 1000;   // 目录缓存有效期：24小时
  var TOC_CACHE_MAX = 10;                     // 目录缓存最多保留10本书（LRU淘汰）
  var MAX_STITCH = 500;

  var state = {
    open: false,
    opening: false,
    root: null,
    win: null,
    visited: {},
    stitchCount: 0,
    pendingInit: null,
    bookKey: null,
    bookTitle: null,
    exiting: false   // 新增：退出标志，用于 beforeunload 判断
  };

  var _tocStop = false;
  var _tocBusy = false;   // 目录抓取进行中标志：防止并列触发导致重复抓取/竞态

  /* ==================== 存储 ==================== */
  function getSettings() {
    try { var v = GM_getValue(KEY_SETTINGS, ''); var o = v ? JSON.parse(v) : null; return (o && typeof o === 'object') ? o : null; } catch (e) { return null; }
  }

  function getWhitelist() {
    try {
      var raw = GM_getValue(KEY_WHITELIST, '[]');
      var list = JSON.parse(raw);
      if (Array.isArray(list) && list.length > 0 && typeof list[0] === 'string') {
        var newList = list.map(function(d) { return { domain: d, title: '' }; });
        saveWhitelist(newList);
        return newList;
      }
      if (Array.isArray(list)) {
        list = list.filter(function(item) { return item && typeof item === 'object' && item.domain; });
        return list;
      }
      return [];
    } catch (e) {
      return [];
    }
  }

  function saveWhitelist(list) {
    try {
      GM_setValue(KEY_WHITELIST, JSON.stringify(list));
    } catch (e) {}
  }

  function inWhitelist(host) {
    var list = getWhitelist();
    for (var i = 0; i < list.length; i++) {
      if (list[i].domain === host) return true;
    }
    return false;
  }

  function getHistory() {
    try { var v = GM_getValue(KEY_HISTORY, '[]'); var h = JSON.parse(v); return Array.isArray(h) ? h : []; } catch (e) { return []; }
  }
  function saveHistory(history) { try { GM_setValue(KEY_HISTORY, JSON.stringify(history)); } catch (e) {} }
  function getPurifyWords() {
    try {
      var v = GM_getValue(KEY_PURIFY, '[]');
      var list = JSON.parse(v);
      if (!Array.isArray(list)) return [];
      return list.filter(function (w) { return typeof w === 'string' && w.trim(); });
    } catch (e) { return []; }
  }
  function savePurifyWords(list) {
    try { GM_setValue(KEY_PURIFY, JSON.stringify(list)); } catch (e) {}
  }
  /* ==================== 目录缓存（最近10本书，24小时过期） ====================
     结构: { [bookKey]: { toc:[{title,url}], tocUrl:'', title:'', savedAt:时间戳 } }
     进入正文页时若命中未过期缓存，直接用缓存目录，不再重新抓取目录页。
     每次读写都会清理：超过24小时的条目删除；超过10本时按 savedAt 最旧的 LRU 淘汰。 */
  function getTocCacheAll() {
    try {
      var v = GM_getValue(KEY_TOC_CACHE, '{}');
      var o = v ? JSON.parse(v) : null;
      return (o && typeof o === 'object' && !Array.isArray(o)) ? o : {};
    } catch (e) { return {}; }
  }
  function saveTocCacheAll(o) {
    try { GM_setValue(KEY_TOC_CACHE, JSON.stringify(o || {})); } catch (e) {}
  }
  function pruneTocCache(cache) {
    if (!cache || typeof cache !== 'object') return {};
    var now = Date.now();
    var keys = Object.keys(cache);
    for (var i = 0; i < keys.length; i++) {
      var k = keys[i], it = cache[k];
      if (!it || !Array.isArray(it.toc) || !it.savedAt || now - it.savedAt > TOC_CACHE_TTL) {
        delete cache[k];
      }
    }
    var remain = Object.keys(cache);
    if (remain.length > TOC_CACHE_MAX) {
      remain.sort(function (a, b) { return cache[a].savedAt - cache[b].savedAt; });
      var drop = remain.length - TOC_CACHE_MAX;
      for (var j = 0; j < drop; j++) delete cache[remain[j]];
    }
    return cache;
  }
  function getTocCacheForBook(bookKey) {
    if (!bookKey) return null;
    var cache = getTocCacheAll();
    var it = cache[bookKey];
    if (!it || !Array.isArray(it.toc) || !it.savedAt) return null;
    if (Date.now() - it.savedAt > TOC_CACHE_TTL) {
      delete cache[bookKey];
      saveTocCacheAll(cache);
      return null;
    }
    return it;
  }
  function saveTocCacheForBook(bookKey, toc, tocUrl, title) {
    if (!bookKey || !toc || !toc.length) return;
    var cache = getTocCacheAll();
    cache[bookKey] = { toc: toc, tocUrl: tocUrl || '', title: title || '', savedAt: Date.now() };
    pruneTocCache(cache);
    saveTocCacheAll(cache);
  }
  function removeTocCacheForBook(bookKey) {
    if (!bookKey) return;
    var cache = getTocCacheAll();
    if (cache[bookKey]) { delete cache[bookKey]; saveTocCacheAll(cache); }
  }

  function extractNovelTitle(title) {
    if (!title) return '';
    var t = title.replace(/[（(][^）)]*[）)]/g, '').trim();
    var match = t.match(/^(.*?)\s*第[0-9零一二三四五六七八九十百千万亿两]+[章节回卷话篇集]/);
    if (match) {
      return match[1].trim() || t;
    }
    return t || '未命名';
  }

  function getBookRootKey(url) {
    try {
      var u = new URL(url);
      var path = u.pathname;
      if (path.endsWith('/')) return u.origin + path;
      var parts = path.split('/').filter(function(p) { return p; });
      if (parts.length === 0) return u.origin + '/';
      var last = parts[parts.length - 1];
      if (/^\d+$/.test(last) || /^\d+\.html?$/i.test(last) || (/^[a-z0-9_-]+\.html?$/i.test(last) && /\d/.test(last))) {
        parts.pop();
      }
      var newPath = '/' + parts.join('/');
      if (!newPath.endsWith('/')) newPath += '/';
      return u.origin + newPath;
    } catch(e) {
      return url;
    }
  }

  function addHistory(chapterTitle, url, bookKey, bookTitle) {
    if (!chapterTitle || !url) return;
    var cleanUrl = url.split('#')[0];
    var key = bookKey || getBookRootKey(cleanUrl);
    var list = getHistory();
    var found = false;
    var finalTitle = bookTitle || extractNovelTitle(chapterTitle) || '未命名';
    for (var i = 0; i < list.length; i++) {
      var item = list[i];
      var existingKey = item.bookKey || getBookRootKey(item.url);
      if (existingKey === key) {
        item.timestamp = Date.now();
        item.url = cleanUrl;
        if (!item.bookKey) item.bookKey = key;
        if (!item.title || item.title === '未命名') {
          item.title = finalTitle;
        }
        found = true;
        break;
      }
    }
    if (!found) {
      list.push({ title: finalTitle, url: cleanUrl, timestamp: Date.now(), bookKey: key });
      if (list.length > 100) {
        list.sort(function(a,b) { return a.timestamp - b.timestamp; });
        list.shift();
      }
    }
    saveHistory(list);
  }

  function fetchSiteTitle(domain, callback) {
    if (!domain) { callback(''); return; }
    var url = 'https://' + domain;
    GM_xmlhttpRequest({
      method: 'GET',
      url: url,
      timeout: 5000,
      onload: function(res) {
        try {
          var html = res.responseText;
          var match = html.match(/<title[^>]*>([^<]*)<\/title>/i);
          if (match && match[1]) {
            callback(match[1].trim());
          } else {
            callback('');
          }
        } catch(e) { callback(''); }
      },
      onerror: function() { callback(''); },
      ontimeout: function() { callback(''); }
    });
  }

  /* ==================== 工具函数 ==================== */
  var CHAP_RE = /(第\s*[0-9零一二三四五六七八九十百千两〇○]+\s*[章节節回卷話篇集]|chapter\s*\d+|序章|楔子|尾声|后记|番外)/i;
  var NAV_WORDS = /^(首页|书架|排行|分类|搜索|登录|注册|完本|最新|书库|书单|我的|消息|反馈|下载|客户端|繁體|繁体|english|返回顶部|上一页|下一页|上一章|下一章|刷新|加入书签|投推荐票|章节错误|字号|夜间模式|手机阅读|电脑版)$/i;
  var TOC_TEXT_RE = /^(目录|目錄|章节目录|返回目录|查看目录|返回书页|书页|目次|章节列表|列表|目录页)$/;

  function resolveUrl(href, base) { try { return new URL(href, base).href; } catch (e) { return ''; } }
  function isBadHref(h2) { return !h2 || h2.indexOf('javascript:') === 0 || h2.charAt(0) === '#' || h2.indexOf('about:') === 0 || h2.indexOf('mailto:') === 0; }
  function noHash(u) { try { return u.split('#')[0]; } catch (e) { return u; } }
  function cleanText(t) { return (t || '').replace(/\s+/g, '').trim(); }
  // 判断 URL 是否为“章节正文页”：末段形如 123.html / 123_1.html / abc123.html。
  // 目录页通常以 / 结尾或无 .html 后缀，不会命中。用于宽松目录匹配的护栏。
  function looksLikeChapterUrl(u) {
    try {
      var segs = (new URL(u).pathname || '').split('/').filter(function (s) { return s; });
      var last = segs[segs.length - 1] || '';
      return /^\d+(?:_\d+)?\.html?$/i.test(last) ||
             (/^[a-z0-9_-]+\.html?$/i.test(last) && /\d/.test(last));
    } catch (e) { return false; }
  }

  function chineseToNumber(ch) {
    if (!ch) return 0;
    var map = { '零':0,'〇':0,'○':0,'一':1,'二':2,'两':2,'三':3,'四':4,'五':5,'六':6,'七':7,'八':8,'九':9,'十':10,'百':100,'千':1000,'万':10000,'亿':100000000 };
    // 无位权数字的“逐位序列”写法：一一零=110、一零二=102（部分站点这样写章号）
    var hasWei = false;
    for (var w = 0; w < ch.length; w++) {
      if (map[ch[w]] >= 10) { hasWei = true; break; }
    }
    if (!hasWei) {
      var n = 0;
      for (var d = 0; d < ch.length; d++) {
        var dv = map[ch[d]];
        if (dv === undefined || dv >= 10) continue;
        n = n * 10 + dv;
      }
      return n;
    }
    var num = 0, temp = 0;
    for (var i=0; i<ch.length; i++) {
      var val = map[ch[i]];
      if (val === undefined) continue;
      if (val >= 10) {
        if (temp === 0) temp = 1;
        num += temp * val;
        temp = 0;
      } else {
        temp = val;
      }
    }
    return num + temp;
  }

  function romanToNumber(roman) {
    var map = { 'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000 };
    var total = 0, prev = 0;
    for (var i=roman.length-1; i>=0; i--) {
      var cur = map[roman[i]];
      if (!cur) continue;
      if (cur < prev) total -= cur;
      else total += cur;
      prev = cur;
    }
    return total;
  }

  function parseChapterNumber(title) {
    if (!title) return null;
    var original = String(title).trim();
    // 预处理①：去掉所有空格（含全角空格），保证空格不影响章号识别
    var clean = original.replace(/[\s\u3000]+/g, '');
    var n = pickChapterNumber(clean);
    if (n !== null) return n;
    // 预处理②：去掉括号及其内容（（）、()、【】、〔〕、「」、『』），避免"（第一卷终）"等干扰排序
    n = pickChapterNumber(clean.replace(/[（(【\[〔〈「『].*?[）)】\]〕〉」』]/g, ''));
    if (n !== null) return n;
    // 兜底：空格分隔的"12 正文"形式在去空格后无法识别，用原标题再试一次
    return pickChapterNumber(original);
  }

  function pickChapterNumber(clean) {
    var match;
    // 阿拉伯数字章号优先（"第405章（第三卷终）"应取章号405，不被括号里的卷号干扰）
    match = clean.match(/第\s*(\d+)\s*[章节回话篇集]/i);
    if (match) return parseInt(match[1], 10);
    // 中文章号（不含"卷"：卷是分卷编号，不是章节号，避免"第025章（第一卷终）"取成卷号1）
    match = clean.match(/第\s*([〇○零一二三四五六七八九十百千万亿两](?:\s*[〇○零一二三四五六七八九十百千万亿两])*)\s*[章节回话篇集]/i);
    if (match) return chineseToNumber(match[1]);
    match = clean.match(/chapter\s*(\d+)/i);
    if (match) return parseInt(match[1], 10);
    match = clean.match(/chapter\s*([IVXLCDM]+)/i);
    if (match) return romanToNumber(match[1]);
    match = clean.match(/^(\d+)[、.．\s]/);
    if (match) return parseInt(match[1], 10);
    match = clean.match(/^([零一二三四五六七八九十百千万亿两]+)[、.．\s]/);
    if (match) return chineseToNumber(match[1]);
    match = clean.match(/^([IVXLCDM]+)[、.．\s]/);
    if (match) return romanToNumber(match[1]);
    return null;
  }

function scoreNext(t) {
  // 支持 下一章 及变体：下—章、下-章、下–章
  if (/^(下一[章節节回卷篇]|下一章节|next\s*chapter|nextchapter|下[—\-–]?[章節节回卷篇])$/i.test(t)) return 5;
  if (/(下一[章節节回卷篇]|下[—\-–]?[章節节回卷篇])/.test(t)) return 4;
  // 支持 下一页 及变体：下—页、下-页、下–页
  if (/^(下一[页頁張张]|下[—\-–]?[页頁張张]|下页|下節|next\s*page|nextpage)$/i.test(t)) return 2;
  if (/^(next|›|»|→|>>?)$/i.test(t)) return 1;
  return 0;
}
  function scorePrev(t) {
    if (/^(上一[章節节回卷篇]|上一章节|prev\s*chapter|prevchapter)$/i.test(t)) return 5;
    if (/(上一[章節节回卷篇])/.test(t)) return 4;
    if (/^(上一[页頁張张]|上页|prev\s*page|prevpage|previous)$/i.test(t)) return 2;
    if (/^(prev|‹|«|←|<<?)$/i.test(t)) return 1;
    return 0;
  }

  /* ==================== 增强模块：规则库 ==================== */
  var SITE_RULES = [
    { name: 'T1', prev: '', next: '', chapter: '.pagee > .main > a[href]', must: ['.pagee > .main > a[href]', '.novelinfvie'] },
    { name: 'T2', prev: '.read_bg .read_nav a#prev_url[href]', next: '.read_bg .read_nav a#next_url[href]', chapter: '.read_bg .read_nav a#info_url[href]' },
    { name: 'T3', prev: '#pagewrap .nav2 .prev a', next: '#pagewrap .nav2 .next a', chapter: '#pagewrap .bcrumb a[rel="category tag"]' },
    { name: 'T4', prev: 'div.container > section.RBGsectionTwo > ul > li.RBGsectionTwo-left > a', next: 'div.container > section.RBGsectionTwo > ul > li.RBGsectionTwo-right > a', chapter: 'div.container > section.RBGsectionTwo > ul > li:nth-child(2) > a' },
    { name: 'T5', prev: '.article > .next_pre > p:nth-child(1) > a', next: '.article > .next_pre > p:nth-child(2) > a', chapter: '' },
    { name: 'T6', prev: '.main > .entry-text > table:nth-child(1) > tbody > tr > td:nth-child(1) > a', next: '.main > .entry-text > table:nth-child(1) > tbody > tr > td:nth-child(2) > a', chapter: '#bcrumb a[rel~="category"]' },
    { name: 'T7', prev: '.container > .post > .page > ul > li:nth-child(1) a', next: '.container > .post > .page > ul > li:nth-child(3) a', chapter: '.container > .breadcrumb > ul > li:nth-child(2) > a' },
    { name: 'T8', prev: '.chapter-page-btn #pb_prev', next: '.chapter-page-btn #pb_next', chapter: '' },
    { name: 'T9', prev: '', next: '', chapter: '#novelbody > .page_chapter > ul > li > a.p3' },
    { name: 'T10', prev: '', next: '', chapter: 'table.title > tbody > tr > td:nth-child(1) > a', must: ['.read_content', '.chapter_content'] },
    { name: 'T11', prev: '#prev_url', next: '#next_url', chapter: '#info_url', must: ['#ReadSet', '.jumbotron', '#chaptercontent', '.container', '.readpage'] },
    { name: 'T12', prev: '#area_newsDet .prevNextBox .pagePrev a', next: '#area_newsDet .prevNextBox .pageNext a', chapter: '#area_newsDet .area_subDetTitle .center a' },
  ];

  /* ==================== 漫画检测与提取 ==================== */
  function isComicPage(doc) {
    // 已按要求移除漫画网页适配：任何页面都不再判定为漫画，自动加载与内容提取全部走正文（文本）路径。
    // 漫画选择器/图片检测全部停用，避免误伤正常小说站点。
    return false;
  }

  function extractComicImages(doc, baseUrl) {
    var imgs = [];
    var seen = {};
    var containers = doc.querySelectorAll(
      '.chapter-content, .comic-content, #images, .chapter-images, .comic-pages, ' +
      '#manga-container, .comic-viewer, .manga-pages, .comic-panel, .img-content, .page-img, .comic-list, ' +
      '.comic-main, .reader-main, .comic-reader'
    );

    var targetNodes = containers.length ? containers : [doc.body];

    targetNodes.forEach(function (container) {
      if (!container) return;
      var allImgs = container.querySelectorAll('img');
      allImgs.forEach(function (img) {
        var src = img.getAttribute('src') ||
                  img.getAttribute('data-src') ||
                  img.getAttribute('data-original') ||
                  img.getAttribute('data-lazy-src') ||
                  img.getAttribute('data-url');
        if (!src) return;
        var lowerSrc = src.toLowerCase();
        if (/logo|avatar|icon|button|header|footer|bg|ad|banner|loading|thumb/i.test(lowerSrc)) return;
        var w = img.width || img.naturalWidth || 0;
        var h = img.height || img.naturalHeight || 0;
        if (w > 0 && h > 0 && (w < 30 || h < 30)) return;
        var absUrl = resolveUrl(src, baseUrl);
        if (!absUrl) return;
        if (seen[absUrl]) return;
        seen[absUrl] = true;
        imgs.push({ src: absUrl, alt: img.getAttribute('alt') || '' });
      });
    });

    if (imgs.length === 0) {
      var allImgs = doc.querySelectorAll('img');
      allImgs.forEach(function (img) {
        var src = img.getAttribute('src') || img.getAttribute('data-src') || img.getAttribute('data-original');
        if (!src) return;
        var lowerSrc = src.toLowerCase();
        if (/logo|avatar|icon|button|header|footer|bg|ad|banner|loading|thumb/i.test(lowerSrc)) return;
        var absUrl = resolveUrl(src, baseUrl);
        if (absUrl && !seen[absUrl]) {
          seen[absUrl] = true;
          imgs.push({ src: absUrl, alt: img.getAttribute('alt') || '' });
        }
      });
    }

    return imgs.slice(0, 50);
  }

  /* ==================== 核心提取函数 ==================== */
  function stripTags(html) { return (html || '').replace(/<[^>]*>/g, ''); }

  function readabilityParse(doc, opts) {
    try {
      var article = new Readability(doc.cloneNode(true), opts || {}).parse();
      return article || null;
    } catch (e) { return null; }
  }

  function collectRuleContent(doc) {
    var contentEls = doc.querySelectorAll('p, div.content, div.chapter-content, #chaptercontent, .novel-content');
    var texts = [];
    for (var j = 0; j < contentEls.length; j++) {
      var text = contentEls[j].innerHTML;
      if (text && text.length > 100) texts.push(text);
    }
    return texts.join('<br>');
  }

  function ruleHref(doc, baseUrl, sel) {
    if (!sel) return '';
    var a = doc.querySelector(sel);
    return a ? resolveUrl(a.getAttribute('href'), baseUrl) : '';
  }

  function extractFromDoc(doc, baseUrl) {
    try {
      return extractFromDocInner(doc, baseUrl);
    } catch (e) {
      // 真实浏览器下个别 DOM 操作可能抛 Illegal invocation 等异常：绝不因此中断，返回空结构让调用方走字符串兜底
      try { console.warn('[阅读模式] 内容提取异常:', baseUrl, e && e.message); } catch (e2) {}
      return { url: baseUrl, title: (doc && doc.title) || '', data: '', textContent: '', next_url: '', prev_url: '', tocUrl: '', toc: [], isComic: false, images: [] };
    }
  }

  function extractFromDocInner(doc, baseUrl) {
    var matchedRule = null;
    for (var i = 0; i < SITE_RULES.length; i++) {
      var rule = SITE_RULES[i];
      if (rule.must && rule.must.every(function (sel) { return doc.querySelector(sel); })) {
        matchedRule = rule;
        break;
      }
    }

    var content = '';
    var title = doc.title || '';
    var nextUrl = '', prevUrl = '', tocUrl = '';

    if (matchedRule) {
      var titleEl = doc.querySelector('title');
      if (titleEl) title = titleEl.textContent.trim();
      content = collectRuleContent(doc);

      if (!content || stripTags(content).trim().length < 150) {
        matchedRule = null;
        content = '';
      }
    }

    /* 内容提取：命中规则用规则选择器，否则回退 Readability / 段落抓取 */
    if (!matchedRule) {
      var article = readabilityParse(doc, { charThreshold: 100 });
      if (article) {
        content = article.content || '';
        title = article.title || title;
      }

      if (!content || content.replace(/\s/g, '').length < 100) {
        var paragraphs = doc.querySelectorAll('p');
        var pTexts = [];
        for (var k = 0; k < paragraphs.length; k++) {
          if (paragraphs[k].innerHTML.length > 50) pTexts.push(paragraphs[k].innerHTML);
        }
        if (pTexts.length > 1) content = pTexts.join('<br>');
        else {
          var bodyText = doc.body.innerHTML;
          if (bodyText && bodyText.length > 200) content = bodyText;
        }
      }
    }

    /* ---- 下一章 / 目录链接识别：直接照搬 1234.js 逻辑 ----
       · rel=next 链接（a[rel=next] 或 link[rel=next]）作为 3 分基线
       · 全量扫描链接文本，按 scoreNext 取最高分（兼容“下—章/下—页”破折号写法）
       · 上一章自动翻页已去掉：不再识别 prev，prev_url 恒为空
       · 目录链接：先 TOC_TEXT_RE 精确词表匹配，未命中再走“包含匹配+护栏”宽松兜底 */
    function relLink(rel) {
      try {
        var el = doc.querySelector('a[rel="' + rel + '"], link[rel="' + rel + '"]');
        if (el) {
          var href = el.getAttribute('href');
          if (!isBadHref(href)) {
            var u = resolveUrl(href, baseUrl);
            if (u && noHash(u) !== noHash(baseUrl)) return u;
          }
        }
      } catch (e) {}
      return null;
    }
    var anchors = [];
    try { anchors = Array.prototype.slice.call(doc.querySelectorAll('a[href]')); } catch (e) {}
    var selfUrl = noHash(baseUrl);
    var rn = relLink('next');
    var nextBest = rn ? { url: rn, score: 3 } : null;
    anchors.forEach(function (a) {
      var href = a.getAttribute('href');
      if (isBadHref(href)) return;
      var u = resolveUrl(href, baseUrl);
      if (!u || noHash(u) === selfUrl) return;
      var t = cleanText(a.textContent);
      if (!t) return;
      var ns = scoreNext(t);
      if (ns > 0 && (!nextBest || ns > nextBest.score)) nextBest = { url: u, score: ns };
    });
    nextUrl = nextBest ? nextBest.url : '';
    prevUrl = '';
    // 兜底：常规扫描未命中时，读取站点脚本里的 nextpage 变量（如 var nextpage = "/book/25365/11.html"）
    if (!nextUrl) {
      try {
        var scrs = doc.querySelectorAll('script');
        for (var si = 0; si < scrs.length; si++) {
          var st = scrs[si].textContent || '';
          var nm = st.match(/var\s+nextpage\s*=\s*["']([^"']+)["']/);
          if (nm) {
            var nu2 = resolveUrl(nm[1], baseUrl);
            if (nu2 && noHash(nu2) !== selfUrl) { nextUrl = nu2; break; }
          }
        }
      } catch (e) {}
    }
    // 第一轮：精确词表匹配（目录/章节目录/书页…），整串等于词表词，最可靠，优先使用。
    // 与第二轮共用护栏：链接目标不得是章节正文页（目录链接指向目录页，不可能指向 章节数字.html）。
    for (var j = 0; j < anchors.length; j++) {
      var href2 = anchors[j].getAttribute('href');
      if (isBadHref(href2)) continue;
      if (TOC_TEXT_RE.test(cleanText(anchors[j].textContent))) {
        var tu = resolveUrl(href2, baseUrl);
        if (tu && noHash(tu) !== selfUrl && !looksLikeChapterUrl(tu)) { tocUrl = tu; break; }
      }
    }

    // 第二轮：宽松“包含匹配”兜底（处理“书页/目录”这类组合文字）。
    // 裸包含会误伤：章节标题可能含“目录”（如《第一百二十四章 目录之争》），
    // 导航文字也可能带“目录”。因此同时满足三重护栏：
    //   ① 文字短（目录标签一般 ≤12 字）；② 不是章节标题（不匹配 CHAP_RE）；
    //   ③ href 不是正文页（末段不是章节数字.html 文件）。
    if (!tocUrl) {
      for (var j2 = 0; j2 < anchors.length; j2++) {
        var a2 = anchors[j2];
        var href3 = a2.getAttribute('href');
        if (isBadHref(href3)) continue;
        var t3 = cleanText(a2.textContent);
        if (!t3 || t3.length > 12) continue;
        if (!/(目录|目錄|书页|書頁|章节目录|目次)/.test(t3)) continue;
        if (CHAP_RE.test(t3)) continue;
        var u3 = resolveUrl(href3, baseUrl);
        if (!u3 || noHash(u3) === selfUrl) continue;
        if (looksLikeChapterUrl(u3)) continue;
        tocUrl = u3;
        break;
      }
    }

    // 第三层备用兜底：正文页显式/宽松目录链接都没找到时，用「删掉章节号」推导书根目录 URL 作为目录页。
    // 注意：推导出的页可能只是“最近更新/部分章节”页，真正的完整目录由 fetchToc
    // 抓取时的“查看完整目录”跟随逻辑（handleFetchToc 内 fullTocUrl 检测）再跳一层补齐。
    if (!tocUrl) {
      try {
        var derivedToc = getBookRootKey(baseUrl);
        var derivedPath = '';
        try { derivedPath = new URL(derivedToc).pathname; } catch (e) {}
        // 只在推导确实“删掉了章节文件段”时启用：排除站点根目录（/）与自身地址
        if (derivedToc && derivedPath && derivedPath !== '/' && noHash(derivedToc) !== selfUrl) {
          tocUrl = derivedToc;
          try { __diag.info('未找到显式目录链接，使用URL推导兜底: ' + tocUrl); } catch (e) {}
        }
      } catch (e) {}
    }

    if (!content || content.replace(/\s/g, '').length < 50) {
      var art = readabilityParse(doc);
      if (art) {
        content = art.content || '';
        title = art.title || title;
      }
    }

    // 漫画适配已移除：isComic 恒 false，images 恒空数组，统一走正文文本路径
    var isComic = false;
    var images = [];

    return {
      url: baseUrl,
      title: title,
      data: content,
      textContent: content ? stripTags(content) : '',
      next_url: nextUrl,
      prev_url: prevUrl,
      tocUrl: tocUrl,
      toc: [],
      isComic: isComic,
      images: images
    };
  }

  // 纯字符串正文/next 兜底：完全不依赖 DOM（避开真实浏览器里 Illegal invocation 类解析异常），
  // 用正则抓 <p> 段落、var nextpage / rel=next / “下一章”锚点、目录锚点
  function fallbackExtractHtml(html, baseUrl) {
    var title = '', data = '', next = '', toc = '';
    try {
      var t = html.match(/<title[^>]*>([\s\S]*?)<\/title>/i);
      if (t) title = t[1].replace(/<[^>]*>/g, '').replace(/\s+/g, ' ').trim();
      var nv = html.match(/var\s+nextpage\s*=\s*["']([^"']+)["']/i);
      if (nv && nv[1]) next = resolveUrl(nv[1], baseUrl);
      if (!next) {
        var rl = html.match(/<link[^>]*rel=["']next["'][^>]*>/i);
        if (rl && rl[0]) {
          var rh = rl[0].match(/href=["']([^"']+)["']/);
          if (rh && rh[1]) next = resolveUrl(rh[1], baseUrl);
        }
      }
      if (!next) {
        var na = html.match(/<a[^>]*href=["']([^"']+)["'][^>]*>[\s\S]*?下一[章节页][\s\S]*?<\/a>/i) ||
                html.match(/<a[^>]*>[\s\S]*?下一[章节页][\s\S]*?<\/a>/i);
        if (na) {
          var nh = na[0].match(/href=["']([^"']+)["']/);
          if (nh && nh[1]) next = resolveUrl(nh[1], baseUrl);
        }
      }
      if (next && noHash(next) === noHash(baseUrl)) next = '';
      var td = html.match(/<a[^>]*href=["']([^"']+)["'][^>]*>[\s\S]*?(?:目录|章节目录)[\s\S]*?<\/a>/i);
      if (td && td[1]) toc = resolveUrl(td[1], baseUrl);
      var ps = html.match(/<p[^>]*>([\s\S]*?)<\/p>/gi);
      if (ps && ps.length) {
        data = ps.join('');
      } else {
        var body = html.match(/<body[^>]*>([\s\S]*?)<\/body>/i);
        if (body && body[1]) data = body[1];
      }
    } catch (e) {}
    return {
      url: baseUrl, title: title, data: data,
      textContent: stripTags(data),
      next_url: next, prev_url: '', tocUrl: toc,
      isComic: false, images: []
    };
  }

  /* ==================== 工具函数（保留） ==================== */
  function showToastIn(doc, id, msg, css, dur) {
    try {
      var old = doc.getElementById(id);
      if (old) old.parentNode.removeChild(old);
      var t = doc.createElement('div');
      t.id = id;
      t.textContent = msg;
      t.style.cssText = css;
      (doc.body || doc.documentElement).appendChild(t);
      setTimeout(function () { try { t.parentNode.removeChild(t); } catch (e) {} }, dur);
    } catch (e) {}
  }

  function toast(msg) {
    showToastIn(document, '__novel_reader_toast__', msg, 'position:fixed;top:16%;left:50%;transform:translateX(-50%);z-index:2147483647;background:rgba(0,0,0,.78);color:#fff;font-size:14px;line-height:1.5;padding:10px 18px;border-radius:20px;font-family:sans-serif;pointer-events:none;white-space:nowrap;', 2400);
  }

  function fetchUrl(url, cb) {
    try {
      return GM_xmlhttpRequest({
        method: 'GET',
        url: url,
        responseType: 'text',
        timeout: 20000,
        headers: { 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' },
        onload: function (r) { cb(null, r.responseText || r.response || ''); },
        onerror: function () { cb('网络错误'); },
        ontimeout: function () { cb('请求超时'); }
      });
    } catch (e) { cb(String(e)); return null; }
  }

  function parseHtml(html, baseUrl) {
    var doc = new DOMParser().parseFromString(html, 'text/html');
    try {
      var baseEl = document.createElement('base');
      baseEl.href = baseUrl;
      doc.head.appendChild(baseEl);
    } catch (e) {}
    return doc;
  }

  function htmlToText(html) {
    if (!html) return '';
    try {
      var doc = new DOMParser().parseFromString('<div id="__tx_root">' + html + '</div>', 'text/html');
      var root = doc.getElementById('__tx_root');
      var bad = root.querySelectorAll('script,style,noscript,iframe,object,embed,form,input,button,select,textarea,link,meta,svg');
      for (var i = 0; i < bad.length; i++) { try { bad[i].parentNode.removeChild(bad[i]); } catch (e) {} }
      var out = [];
      (function walk(node) {
        var children = node.childNodes;
        for (var k = 0; k < children.length; k++) {
          var n = children[k];
          if (n.nodeType === 3) { out.push(n.nodeValue || ''); }
          else if (n.nodeType === 1) {
            var tag = (n.tagName || '').toLowerCase();
            if (tag === 'br') { out.push('\n'); continue; }
            walk(n);
            if (/^(p|div|li|h[1-6]|blockquote|section|article|tr|ul|ol|table|pre|figure|figcaption|dd|dt|hr)$/.test(tag)) out.push('\n');
          }
        }
      })(root);
      var text = out.join('');
      text = text.replace(/\r/g, '');
      text = text.replace(/[ \t\u00a0\u3000]+/g, ' ');
      text = text.replace(/ ?\n ?/g, '\n');
      text = text.replace(/\n{3,}/g, '\n\n');
      return text.trim();
    } catch (e) {
      return String(html).replace(/<[^>]*>/g, '').trim();
    }
  }

  // ==================== 分页噪声行判定（下载与阅读正文共用） ====================
  // 页码标记：第X章（第Y页）/（第Y页）/第 X/Y 页 / 裸 X/Y
  function isPageMarkerLine(t) {
    if (!t) return false;
    var s = String(t).replace(/\s+/g, '');
    if (!s) return false;
    if (/^第[0-9零一二三四五六七八九十百千万亿两]+[章节回卷话篇集]/.test(s) && /[（(]第.*?页[）)]/.test(s)) return true;
    if (/^[（(]第.*?页[）)]$/.test(s)) return true;
    if (/^第\s*[（(]?\s*\d+\s*\/\s*\d+\s*[）)]?\s*页$/.test(s)) return true;
    if (/^第\s*\d+\s*页$/.test(s)) return true;
    return false;
  }
  // “本章未完，下一页继续阅读”类分页提示行判定（比旧版做更多适配）
  function isNextPagePromptLine(t) {
    if (!t) return false;
    var s = String(t).replace(/\s+/g, '');
    if (!s) return false;
    // ① 本章/正文/本书/内容 + 未完(未完结/尚未结束/待续…) + 下一页/下页/翻页/继续阅读/点击/翻
    if (/(本章|正文|本书|内容)/.test(s) &&
        /(未完|未完结|尚未结束|没有结束|未结束|待续)/.test(s) &&
        /(下一页|下页|翻页|翻到|继续阅读|点击|请翻|下一頁|下頁|翻頁)/.test(s)) return true;
    // ② “未完待续”独立短句（含括号包裹）
    if (/^[（(【\[]?(本章)?未完待续[）)】\]]?[，。,!！?？…~~\s]*$/.test(s)) return true;
    // ③ “下一页/下页/翻页 + 继续阅读”独立短句（含“点击/请翻到”引导、“继续阅读本章”等后缀）
    if (/^(点击|请|请点|轻点|点)?(翻到|前往|点击)?(下一页|下页|翻页|下一頁|下頁|翻頁)(继续阅读|继续|阅读|查看)?(本章内容|本章|本页|正文)?[。！!？?…~\s]*$/.test(s)) return true;
    if (/^(请|点|点击)?(翻到|前往)?(下一页|下页|翻页|下一頁|下頁|翻頁)[^。！？\n]{0,10}(继续|继续阅读|阅读)[。！!？?…~\s]*$/.test(s)) return true;
    return false;
  }
  function isPageNoiseLine(t) {
    return isPageMarkerLine(t) || isNextPagePromptLine(t);
  }
  function cleanDownloadText(text) {
    if (!text) return text;
    var lines = text.split('\n');
    var cleaned = [];
    for (var i = 0; i < lines.length; i++) {
      var line = lines[i].trim();
      if (isPageNoiseLine(line)) continue;
      cleaned.push(lines[i]);
    }
    return cleaned.join('\n');
  }

  // 去掉每页开头的“章节标题行”（第X章/序章/楔子/番外…），
  // 避免分页站每页正文都内嵌标题，拼接后连出多个“第一章”。finalize 统一在头部加一次章名。
  // 护栏：短行(≤30字)且不含句子标点，避免把“第X章……”开头的正文句误删。
  function stripLeadingChapterHeading(text) {
    if (!text) return text;
    var lines = String(text).split('\n');
    var re = /^(第\s*[0-9零一二三四五六七八九十百千两〇○]+\s*[章节節回卷話篇集]|chapter\s*\d+|序章|楔子|尾声|后记|番外)(\s|[:：]|$)/i;
    var changed = false;
    while (lines.length) {
      var line = lines[0].trim();
      if (!line) { lines.shift(); continue; }            // 跳过开头空行
      if (line.length <= 30 && re.test(line) && !/[。！？，；、]/.test(line)) { lines.shift(); changed = true; }
      else break;
    }
    if (!changed) return text;
    return lines.join('\n').replace(/^\n+/, '');
  }
  /* ==================== 正文净化（净化词拦截） ====================
     规则：正文中包含净化词的"句子"整句清除。
       · 句子 = 净化词前后直接连接在一起的连续文字（不含标点）。
       · 标点（中英文标点）只作分隔符，不纳入连接范围。
       · 夹在英文（英文字母 a-zA-Z 两侧）中间的 / 与 . 视为文字，不切断英文整体；
         未夹在英文中间的 / 与 . 仍按标点处理（分隔符）。
       · 英文净化词（含 a-zA-Z）前后直接紧邻的 / 与 . 视为文字，一并纳入。
       · 隔离：净化词前加 / 表示左侧隔离、后加 / 表示右侧隔离——
         隔离侧只清除净化词本身，该侧任何前后文字（含句末标点）都不清理。
       · 被清除句子紧跟的句末标点顺带清除，避免正文残留孤立标点。
  ================================================================== */
  function isPunctChar(c) {
    return '，。！？；：、,.!?;:()（）【】《》〈〉「」『』〔〕[]{}“”‘’"\'…—·–-~@#%^&*=+$¥€<>|\\/'.indexOf(c) !== -1;
  }
  function isEnglishWord(w) { return /[a-zA-Z]/.test(w); }
  function isEngLetter(c) { return /[a-zA-Z]/.test(c); }
  // 解析净化词：剥离首尾 "/" 作为隔离标记，返回核心词与左右隔离标志
  function parsePurifyWord(w) {
    var s = String(w);
    var isoLeft = false, isoRight = false;
    while (s.charAt(0) === '/') { isoLeft = true; s = s.slice(1); }
    while (s.charAt(s.length - 1) === '/') { isoRight = true; s = s.slice(0, s.length - 1); }
    return { core: s, isoLeft: isoLeft, isoRight: isoRight };
  }
  function markPurifyRun(text, mark, start, L, eng, isoLeft, isoRight) {
    var n = text.length;
    var i, j, k, c;
    for (i = start; i < start + L && i < n; i++) mark[i] = true;
    // '/' 或 '.' 是否应视为文字：紧邻英文净化词，或夹在英文字母中间
    function slashIsText(idx, adjacentToWord) {
      var ch = text.charAt(idx);
      if (ch !== '/' && ch !== '.') return false;
      if (eng && adjacentToWord) return true;
      if (idx > 0 && idx < n - 1 &&
          isEngLetter(text.charAt(idx - 1)) && isEngLetter(text.charAt(idx + 1))) return true;
      return false;
    }
    if (!isoLeft) {
      j = start - 1;
      while (j >= 0) {
        c = text.charAt(j);
        if (isPunctChar(c)) {
          if (slashIsText(j, j === start - 1)) { mark[j] = true; j--; continue; }
          break;
        }
        mark[j] = true; j--;
      }
    }
    if (!isoRight) {
      k = start + L;
      while (k < n) {
        c = text.charAt(k);
        if (isPunctChar(c)) {
          if (slashIsText(k, k === start + L)) { mark[k] = true; k++; continue; }
          break;
        }
        mark[k] = true; k++;
      }
      // 清除该句紧跟的连续句末标点，避免孤立标点残留
      while (k < n && isPunctChar(text.charAt(k))) { mark[k] = true; k++; }
    }
  }
  function purifyText(text, words) {
    if (!text || !words || !words.length) return text;
    var n = text.length;
    var mark = new Array(n);
    var i;
    for (i = 0; i < n; i++) mark[i] = false;
    for (var wi = 0; wi < words.length; wi++) {
      var w = words[wi];
      if (!w) continue;
      var p = parsePurifyWord(w);
      var core = p.core;
      var L = core.length;
      if (L === 0 || L > n) continue;
      var eng = isEnglishWord(core);
      var pos = 0;
      while (pos <= n - L) {
        var idx = text.indexOf(core, pos);
        if (idx === -1) break;
        markPurifyRun(text, mark, idx, L, eng, p.isoLeft, p.isoRight);
        pos = idx + 1;
      }
    }
    var out = '';
    for (i = 0; i < n; i++) if (!mark[i]) out += text.charAt(i);
    return out;
  }
  // 对已插入 DOM 的元素递归净化其文本节点（用于净化词变更后即时重净）
  function purifyDomElement(el, words) {
    if (!el || !words || !words.length) return;
    var walk = function (node) {
      var children = node.childNodes;
      for (var i = 0; i < children.length; i++) {
        var c = children[i];
        if (c.nodeType === 3) {
          var v = c.nodeValue;
          if (v && /[A-Za-z0-9\u4e00-\u9fa5]/.test(v)) {
            var clean = purifyText(v, words);
            if (clean !== v) c.nodeValue = clean;
          }
        } else if (c.nodeType === 1) {
          walk(c);
        }
      }
    };
    walk(el);
  }
  // 对 HTML 字符串净化（渲染前处理），保留标签结构，只清除文本节点中的命中句子
  function purifyHtml(html, words) {
    if (!html || !words || !words.length) return html;
    try {
      var doc = new DOMParser().parseFromString('<div id="__purify_root">' + html + '</div>', 'text/html');
      var root = doc.getElementById('__purify_root');
      if (!root) return html;
      purifyDomElement(root, words);
      return root.innerHTML;
    } catch (e) { return html; }
  }
  // 目录页章节名解析（阅读正文使用）：
  // 正文里显示的章节名改为“从目录页抓取的章节名”，替代正文页自身的 title。
  // normReaderUrl：URL 归一化（去 hash/query/末尾斜杠；并保留“再去 .html/.htm”的第二级），兼容目录与正文 URL 的细微差异。
  // 返回 [原级, 去.html级] 两个字符串；tocTitleForUrl 中任一级相等即视为同一章节。
  function normReaderUrl(u) {
    if (!u) return null;
    var s = String(u);
    try { s = new URL(s).href; } catch (e) {}
    s = s.split('#')[0].split('?')[0].replace(/\/+$/, '');
    return [s, s.replace(/\.html?$/i, '')];
  }
  // 在目录数组（[{title,url},...]）中找与当前章节对应的目录名；未命中返回 ''（由调用方回退正文 title）。
  // 两级匹配：
  //   ① URL 整体等价匹配（原级/去.html级），绝不子串匹配，避免 “123” 误配到 “12345” 之类的错章；
  //   ② 章节号兜底：目录与正文的 URL 可能不一致，但“第N章”语义一致——正文 title 的章号命中目录条目的章号，
  //      就用该目录条目的完整章节名（如正文 title “第101章 避无可避 (第1/2页)” → 目录 “第101章 避无可避”）。
  function tocTitleForUrl(toc, url, bodyTitle) {
    if (!toc || !toc.length) return '';
    if (url) {
      var target = normReaderUrl(url);
      if (target) {
        var a = target[0], b = target[1];
        for (var i = 0; i < toc.length; i++) {
          var it = toc[i];
          if (!it || !it.url) continue;
          var t = normReaderUrl(it.url);
          if (!t) continue;
          if (t[0] === a || t[0] === b || t[1] === a || t[1] === b) return it.title || '';
        }
      }
    }
    if (bodyTitle) {
      var bn = parseChapterNumber(bodyTitle);
      if (bn !== null && bn > 0) {
        for (var j = 0; j < toc.length; j++) {
          var tj = toc[j];
          if (!tj || !tj.title) continue;
          var tn = parseChapterNumber(tj.title);
          if (tn !== null && tn === bn) return tj.title || '';
        }
      }
    }
    return '';
  }
  // 下载文本净化：按行（段落）分别净化，与阅读器逐文本节点净化保持一致
  function purifyLines(text, words) {
    if (!text || !words || !words.length) return text;
    var lines = String(text).split('\n');
    for (var i = 0; i < lines.length; i++) {
      if (/[A-Za-z0-9\u4e00-\u9fa5]/.test(lines[i])) {
        var clean = purifyText(lines[i], words);
        if (clean !== lines[i]) lines[i] = clean;
      }
    }
    return lines.join('\n');
  }

  // ==================== 阅读正文清洗（与下载清洗同规则，但保留 HTML 结构） ====================
  // 收集根内所有“有文字、无元素子节点”的叶子元素（按文档顺序；跳过 img/br）
  function collectLeafTextEls(root) {
    var list = [];
    (function walk(node) {
      var kids = node.childNodes;
      for (var i = 0; i < kids.length; i++) {
        var c = kids[i];
        if (c.nodeType !== 1) continue;
        var el = c;
        if (el.tagName === 'IMG' || el.tagName === 'BR') continue;
        var hasElChild = false;
        for (var j = 0; j < el.childNodes.length; j++) {
          var cc = el.childNodes[j];
          if (cc.nodeType === 1 && cc.tagName !== 'BR') { hasElChild = true; break; }
        }
        if (!hasElChild && (el.textContent || '').replace(/\s+/g, '').trim()) list.push(el);
        walk(el);
      }
    })(root);
    return list;
  }
  // 只对根内“首部/尾部”叶子元素删除分页噪声，正文中间不碰（避免误杀正文）。
  // 分页站的页码、未完下一页提示都出现在每页首尾，正文中间极少出现这类整行。
  function removePageNoiseLeafs(root, maxHead, maxTail) {
    var leaves = collectLeafTextEls(root);
    if (!leaves.length) return;
    var h = Math.min(leaves.length, maxHead || 8);
    var t = Math.min(leaves.length, maxTail || 8);
    for (var j = 0; j < leaves.length; j++) {
      var inHead = j < h;
      var inTail = j >= leaves.length - t;
      if (!inHead && !inTail) continue;
      var el = leaves[j];
      if (el.querySelector && el.querySelector('img')) continue;
      var text = (el.textContent || '').replace(/\s+/g, '').trim();
      if (!text) continue;
      if (isPageNoiseLine(text)) el.parentNode.removeChild(el);
    }
  }
  // 删除正文开头“章节标题行”叶子元素（与下载 stripLeadingChapterHeading 同规则；只匹配开头）
  // 首页分页专用：.chapter-title 已单独显示标题，正文里源站写的“第X章…”标题行必须删掉，避免重复。
  // 扫描开头最多 6 个叶子，命中“章节标题行”即删；正文句（带标点/超长/不以章名开头）不会命中。
  function stripLeadingHeadingDom(root) {
    var re = /^(第\s*[0-9零一二三四五六七八九十百千两〇○]+\s*[章节節回卷話篇集]|chapter\s*\d+|序章|楔子|尾声|后记|番外)(\s|[:：]|$)/i;
    var leaves = collectLeafTextEls(root);
    var maxScan = Math.min(leaves.length, 6);
    for (var k = 0; k < maxScan; k++) {
      var el = leaves[k];
      if (!el || !el.parentNode) continue;
      var text = (el.textContent || '').trim();
      if (!text) continue;
      if (text.length <= 30 && re.test(text) && !/[。！？，；、]/.test(text)) {
        el.parentNode.removeChild(el);
      }
    }
  }
  // 阅读正文 HTML 清洗：去分页噪声 → 去开头章节标题 → 净化词
  function cleanReaderHtml(html, words, opts) {
    if (!html) return html;
    try {
      var doc = new DOMParser().parseFromString('<div id="__reader_clean_root">' + html + '</div>', 'text/html');
      var root = doc.getElementById('__reader_clean_root');
      if (!root) return html;
      removePageNoiseLeafs(root);
      if (!opts || opts.stripLeadingHeading !== false) stripLeadingHeadingDom(root);
      purifyDomElement(root, words);
      return root.innerHTML;
    } catch (e) { return html; }
  }

  function saveTextFile(text) {
    var title = state.bookTitle || window.top.document.title || 'novel';
    var blob = new Blob([text], { type: 'text/plain;charset=utf-8' });
    var a = document.createElement('a');
    a.href = URL.createObjectURL(blob);
    a.download = title.replace(/[\*\/:<>\?\\\|\r\n,]/g, '_') + '.txt';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    setTimeout(function () { try { URL.revokeObjectURL(a.href); } catch (e) {} }, 10000);
  }

  /* ==================== iframe 阅读器（与之前一致，包含图片过滤） ==================== */
  var READER_CSS = "*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}body,html{height:100%;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,\"PingFang SC\",\"Hiragino Sans GB\",\"Microsoft YaHei\",sans-serif;transition:background-color .3s,color .3s}body.theme-white{background:#fff;color:#2b2b2b}body.theme-warm{background:#f7f0e3;color:#4a3f35}body.theme-green{background:#d7e8d4;color:#364736}body.theme-dark{background:#1b1b1f;color:#a8a8a8}.topbar{position:fixed;top:0;left:0;right:0;z-index:100;height:48px;display:flex;align-items:center;padding:0 12px;transition:transform .25s,background-color .3s;transform:translateY(-100%)}.topbar.visible{transform:translateY(0)}.theme-white .topbar{background:rgba(255,255,255,.96);box-shadow:0 2px 8px rgba(0,0,0,.05)}.theme-warm .topbar{background:rgba(247,240,227,.96);box-shadow:0 2px 8px rgba(0,0,0,.05)}.theme-green .topbar{background:rgba(215,232,212,.96);box-shadow:0 2px 8px rgba(0,0,0,.05)}.theme-dark .topbar{background:rgba(27,27,31,.96);box-shadow:0 2px 8px rgba(0,0,0,.2)}.topbar .btn-back{width:36px;height:36px;border:none;background:0 0;font-size:22px;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:50%}.theme-green .btn-back,.theme-warm .btn-back,.theme-white .btn-back{color:#555}.theme-dark .btn-back{color:#aaa}.topbar .bar-title{flex:1;text-align:center;font-size:15px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 8px;opacity:.7}.topbar .btn-catalog{width:36px;height:36px;border:none;background:0 0;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:50%}.topbar .btn-catalog svg{width:20px;height:20px}.theme-green .btn-catalog,.theme-warm .btn-catalog,.theme-white .btn-catalog{color:#555}.theme-dark .btn-catalog{color:#aaa}.content-wrapper{position:relative;height:100%;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:60px 20px 80px}.chapter-block{margin-bottom:24px}.chapter-divider{display:flex;align-items:center;justify-content:center;gap:8px;min-width:0;margin:16px 0 24px;opacity:.4;font-size:12px;white-space:nowrap}.chapter-divider::after,.chapter-divider::before{content:\"\";display:block;flex:1 1 12px;min-width:12px;max-width:30%;height:1px;background:currentColor;opacity:.5}.chapter-divider-title{display:block;flex:0 1 auto;min-width:0;max-width:calc(100% - 56px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chapter-title{font-weight:700;text-align:center;margin-bottom:24px;line-height:1.4}.chapter-content{line-height:1.9;text-align:justify;word-break:break-all}.chapter-content p{margin-bottom:1em}.chapter-content img{max-width:100%;height:auto;border-radius:4px;margin:8px 0}.stitch-loading{text-align:center;padding:16px 0;opacity:.5;font-size:13px;visibility:hidden;min-height:48px}.stitch-loading.visible{visibility:visible}.stitch-loading .spinner{display:inline-block;width:14px;height:14px;border:2px solid currentColor;border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite;vertical-align:middle;margin-right:6px}.chapter-content img.reader-img-loading{min-height:160px;background-color:#eee;background-repeat:no-repeat;background-position:center;background-size:auto;background-image:url(\"data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='200' viewBox='0 0 300 200'%3E%3Crect width='100%25' height='100%25' fill='%23eeeeee'/%3E%3Cg fill='%23bbbbbb' transform='translate(130,80)'%3E%3Crect x='0' y='0' width='40' height='30' rx='3' ry='3' fill='none' stroke='%23bbbbbb' stroke-width='2'/%3E%3Ccircle cx='10' cy='10' r='3'/%3E%3Cpath d='M2,28 L14,16 L22,22 L32,10 L38,16 L38,28 Z'/%3E%3C/g%3E%3Ctext x='50%25' y='75%25' text-anchor='middle' font-family='sans-serif' font-size='12' fill='%23999999'%3ELoading...%3C/text%3E%3C/svg%3E\")}.loading{display:flex;align-items:center;justify-content:center;height:60%;flex-direction:column;opacity:.5;font-size:14px}.loading .spinner{width:24px;height:24px;border:2px solid currentColor;border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite;margin-bottom:12px}@keyframes spin{to{transform:rotate(360deg)}}.bottombar{position:fixed;bottom:0;left:0;right:0;z-index:100;transition:transform .25s,background-color .3s;transform:translateY(100%)}.bottombar.visible{transform:translateY(0)}.theme-white .bottombar{background:rgba(255,255,255,.97);box-shadow:0 -2px 8px rgba(0,0,0,.05)}.theme-warm .bottombar{background:rgba(247,240,227,.97);box-shadow:0 -2px 8px rgba(0,0,0,.05)}.theme-green .bottombar{background:rgba(215,232,212,.97);box-shadow:0 -2px 8px rgba(0,0,0,.05)}.theme-dark .bottombar{background:rgba(27,27,31,.97);box-shadow:0 -2px 8px rgba(0,0,0,.2)}.toolbar-row{display:flex;height:52px;align-items:center;justify-content:space-around}.toolbar-btn{border:none;background:0 0;font-size:12px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:3px;padding:4px 6px;border-radius:8px;transition:all .15s}.toolbar-btn svg{width:22px;height:22px}.theme-white .toolbar-btn{color:#555}.theme-warm .toolbar-btn{color:#6b5d4e}.theme-green .toolbar-btn{color:#4a6a4a}.theme-dark .toolbar-btn{color:#999}.toolbar-btn:active{opacity:.6}.toolbar-btn.active{font-weight:600}.theme-white .toolbar-btn.active{color:#333}.theme-warm .toolbar-btn.active{color:#4a3f35}.theme-green .toolbar-btn.active{color:#2d4a2d}.theme-dark .toolbar-btn.active{color:#ddd}.settings-panel{position:fixed;bottom:0;left:0;right:0;z-index:200;padding:20px 20px 28px;border-radius:16px 16px 0 0;transition:transform .3s cubic-bezier(.32,.72,0,1);transform:translateY(100%)}.settings-panel.visible{transform:translateY(0)}.theme-white .settings-panel{background:#fff;box-shadow:0 -4px 20px rgba(0,0,0,.1)}.theme-warm .settings-panel{background:#f7f0e3;box-shadow:0 -4px 20px rgba(0,0,0,.08)}.theme-green .settings-panel{background:#d7e8d4;box-shadow:0 -4px 20px rgba(0,0,0,.08)}.theme-dark .settings-panel{background:#262630;box-shadow:0 -4px 20px rgba(0,0,0,.3)}.settings-panel .panel-handle{width:36px;height:4px;border-radius:2px;margin:0 auto 16px}.theme-white .panel-handle{background:#ddd}.theme-warm .panel-handle{background:#d6c9ae}.theme-green .panel-handle{background:#b0c9ac}.theme-dark .panel-handle{background:#444}.settings-mask{position:fixed;top:0;left:0;right:0;bottom:0;z-index:150;background:rgba(0,0,0,.3);display:none}.settings-mask.visible{display:block}.setting-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.setting-row:last-child{margin-bottom:0}.setting-label{font-size:13px;opacity:.6;min-width:48px}.font-controls{display:flex;align-items:center;flex:1;margin-left:12px}.font-controls button{width:40px;height:36px;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .15s}.theme-white .font-controls button{background:#f0f0f0;color:#333}.theme-warm .font-controls button{background:#ebe0cc;color:#4a3f35}.theme-green .font-controls button{background:#c1d9bd;color:#364736}.theme-dark .font-controls button{background:#2a2a30;color:#ccc}.font-controls button:active{transform:scale(.92)}.font-controls .font-size-val{flex:1;text-align:center;font-size:14px;font-weight:500}.spacing-controls{display:flex;gap:8px;flex:1;margin-left:12px}.spacing-controls button{flex:1;height:34px;border:none;border-radius:8px;font-size:12px;cursor:pointer;transition:all .15s}.theme-white .spacing-controls button{background:#f0f0f0;color:#555}.theme-warm .spacing-controls button{background:#ebe0cc;color:#5c4b37}.theme-green .spacing-controls button{background:#c1d9bd;color:#364736}.theme-dark .spacing-controls button{background:#2a2a30;color:#999}.spacing-controls button.active{font-weight:700}.theme-white .spacing-controls button.active{background:#333;color:#fff}.theme-warm .spacing-controls button.active{background:#7a6652;color:#f7f0e3}.theme-green .spacing-controls button.active{background:#4a6e4a;color:#e8f4e6}.theme-dark .spacing-controls button.active{background:#555;color:#eee}.theme-options{display:flex;gap:12px;flex:1;margin-left:12px;justify-content:center}.theme-dot{width:36px;height:36px;border-radius:50%;border:2px solid transparent;cursor:pointer;position:relative;transition:all .15s}.theme-dot:active{transform:scale(.9)}.theme-dot.active{border-color:#666}.theme-dark .theme-dot.active{border-color:#aaa}.dot-white{background:#fff;box-shadow:inset 0 0 0 1px #ddd}.dot-warm{background:#f7f0e3;box-shadow:inset 0 0 0 1px #d6c9ae}.dot-green{background:#d7e8d4;box-shadow:inset 0 0 0 1px #a8c9a4}.dot-dark{background:#1b1b1f;box-shadow:inset 0 0 0 1px #444}.overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:50;display:none}.overlay.visible{display:block}.catalog-mask{position:fixed;top:0;left:0;right:0;bottom:0;z-index:250;background:rgba(0,0,0,.4);opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}.catalog-mask.visible{opacity:1;visibility:visible}.catalog-sidebar{position:fixed;top:0;right:0;bottom:0;width:75%;max-width:320px;z-index:300;display:flex;flex-direction:column;transform:translateX(100%);transition:transform .3s cubic-bezier(.32,.72,0,1)}.catalog-sidebar.visible{transform:translateX(0)}.theme-white .catalog-sidebar{background:#fff}.theme-warm .catalog-sidebar{background:#f7f0e3}.theme-green .catalog-sidebar{background:#d7e8d4}.theme-dark .catalog-sidebar{background:#1e1e24}.catalog-header{padding:16px 20px 12px;font-size:16px;font-weight:600;flex-shrink:0;display:flex;align-items:center;justify-content:space-between}.theme-white .catalog-header{border-bottom:1px solid #eee}.theme-warm .catalog-header{border-bottom:1px solid #e2d6c0}.theme-green .catalog-header{border-bottom:1px solid #b8cfb4}.theme-dark .catalog-header{border-bottom:1px solid #333}.catalog-header .header-buttons{display:flex;gap:6px;align-items:center}.catalog-header button{font-size:12px;border:none;background:rgba(128,128,128,.16);color:inherit;opacity:.75;border-radius:12px;padding:4px 10px;cursor:pointer;white-space:nowrap}.catalog-header button:hover{opacity:1}.catalog-list{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:8px 0}.catalog-item{display:block;padding:12px 20px;font-size:14px;line-height:1.4;cursor:pointer;transition:background .15s;text-decoration:none;color:inherit}.catalog-item:active{opacity:.6}.catalog-item.active{font-weight:600}.theme-white .catalog-item.active{color:#1a73e8;background:#f0f6ff}.theme-warm .catalog-item.active{color:#8b6914;background:#f0e8d0}.theme-green .catalog-item.active{color:#2e7d32;background:#c5e1c8}.theme-dark .catalog-item.active{color:#7cacf8;background:#262630}.catalog-empty{padding:40px 20px;text-align:center;font-size:13px;opacity:.4}.panel-extra{position:fixed;bottom:0;left:0;right:0;z-index:220;padding:20px 20px 28px;border-radius:16px 16px 0 0;transition:transform .3s cubic-bezier(.32,.72,0,1);transform:translateY(100%);height:70vh;display:flex;flex-direction:column}.panel-extra.visible{transform:translateY(0)}.theme-white .panel-extra{background:#fff;box-shadow:0 -4px 20px rgba(0,0,0,.1)}.theme-warm .panel-extra{background:#f7f0e3;box-shadow:0 -4px 20px rgba(0,0,0,.08)}.theme-green .panel-extra{background:#d7e8d4;box-shadow:0 -4px 20px rgba(0,0,0,.08)}.theme-dark .panel-extra{background:#262630;box-shadow:0 -4px 20px rgba(0,0,0,.3)}.panel-extra .panel-handle{width:36px;height:4px;border-radius:2px;margin:0 auto 16px}.theme-white .panel-handle{background:#ddd}.theme-warm .panel-handle{background:#d6c9ae}.theme-green .panel-handle{background:#b0c9ac}.theme-dark .panel-handle{background:#444}.panel-extra .panel-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:16px;font-weight:600}.panel-extra .panel-close{background:0 0;border:none;font-size:22px;cursor:pointer;opacity:.5;padding:0 6px;transition:opacity .2s}.panel-extra .panel-close:hover{opacity:1}.panel-extra .panel-list-wrap{position:relative;flex:1;overflow:hidden;min-height:0}.panel-extra .panel-list{position:absolute;top:0;left:0;right:0;bottom:0;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:4px 0;scroll-behavior:smooth}.panel-extra .panel-item{padding:10px 6px;border-bottom:1px solid rgba(128,128,128,.15);display:flex;justify-content:space-between;align-items:center;font-size:14px;transition:background .1s;cursor:default}.panel-extra .panel-item .item-main{flex:1;display:flex;justify-content:space-between;align-items:center;overflow:hidden;cursor:pointer}.panel-extra .panel-item .item-main:active{opacity:.6}.panel-extra .panel-item .item-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-right:8px}.panel-extra .panel-item .item-del{background:0 0;border:none;font-size:16px;cursor:pointer;opacity:.3;padding:0 4px;transition:opacity .2s;color:inherit;line-height:1}.panel-extra .panel-item .item-del:hover{opacity:.9}.panel-extra .panel-empty{padding:30px 20px;text-align:center;opacity:.4;font-size:13px}.panel-extra .fade-mask{position:absolute;left:0;right:0;height:24px;pointer-events:none;z-index:2;transition:opacity .2s}.panel-extra .fade-mask.top{top:0;background:linear-gradient(to bottom,var(--bg),transparent)}.panel-extra .fade-mask.bottom{bottom:0;background:linear-gradient(to top,var(--bg),transparent)}.panel-extra .fade-mask.hidden{opacity:0}.theme-white .panel-extra{--bg:#fff}.theme-warm .panel-extra{--bg:#f7f0e3}.theme-green .panel-extra{--bg:#d7e8d4}.theme-dark .panel-extra{--bg:#262630}";

  var READER_BODY = "<div class=\"topbar\" id=\"topbar\">\n  <button class=\"btn-back\" id=\"btnBack\"><svg viewBox=\"0 0 24 24\" width=\"22\" height=\"22\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polyline points=\"15 18 9 12 15 6\"/></svg></button>\n  <div class=\"bar-title\" id=\"barTitle\"></div>\n  <button class=\"btn-catalog\" id=\"btnCatalog\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><line x1=\"3\" y1=\"6\" x2=\"21\" y2=\"6\"/><line x1=\"3\" y1=\"12\" x2=\"16\" y2=\"12\"/><line x1=\"3\" y1=\"18\" x2=\"12\" y2=\"18\"/></svg></button>\n</div>\n<div class=\"overlay\" id=\"overlay\"></div>\n<div class=\"catalog-mask\" id=\"catalogMask\"></div>\n<div class=\"catalog-sidebar\" id=\"catalogSidebar\">\n  <div class=\"catalog-header\" id=\"catalogHeader\">\n    <span>目录</span>\n    <span id=\"tocProgress\" style=\"display:none;font-size:13px;opacity:0.7;margin-left:8px;\"></span>\n    <div class=\"header-buttons\">\n      <button id=\"btnDownloadAll\">下载全部</button>\n      <button id=\"btnLoadToc\">加载目录页</button>\n    </div>\n  </div>\n  <div class=\"catalog-list\" id=\"catalogList\"><div class=\"catalog-empty\" id=\"catalogEmpty\">暂无目录</div></div>\n</div>\n<div class=\"content-wrapper\" id=\"contentWrapper\">\n  <div class=\"loading\" id=\"loadingTip\"><div class=\"spinner\"></div><span id=\"loadingText\">正在加载内容...</span></div>\n  <div id=\"articleContainer\" style=\"display:none\">\n    <div id=\"chaptersHost\"></div>\n    <div class=\"stitch-loading\" id=\"stitchLoadingNext\"><span class=\"spinner\"></span><span id=\"stitchLoadingText\">正在加载下一章...</span></div>\n  </div>\n</div>\n<div class=\"bottombar\" id=\"bottombar\">\n  <div class=\"toolbar-row\">\n    <button class=\"toolbar-btn\" id=\"btnWhitelist\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z\"/><polyline points=\"9 12 11 14 15 10\"/></svg><span>白名单</span></button>\n    <button class=\"toolbar-btn\" id=\"btnHistory\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"/><polyline points=\"12 6 12 12 16 14\"/></svg><span>历史</span></button>\n    <button class=\"toolbar-btn\" id=\"btnNightMode\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><path d=\"M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z\"/></svg><span>夜间</span></button>\n    <button class=\"toolbar-btn\" id=\"btnManagePurify\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><line x1=\"8\" y1=\"6\" x2=\"21\" y2=\"6\"/><line x1=\"8\" y1=\"12\" x2=\"21\" y2=\"12\"/><line x1=\"8\" y1=\"18\" x2=\"21\" y2=\"18\"/><line x1=\"3\" y1=\"6\" x2=\"3.01\" y2=\"6\"/><line x1=\"3\" y1=\"12\" x2=\"3.01\" y2=\"12\"/><line x1=\"3\" y1=\"18\" x2=\"3.01\" y2=\"18\"/></svg><span>管理净化</span></button>\n    <button class=\"toolbar-btn\" id=\"btnSettings\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"3\"/><path d=\"M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 1 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 1 1-2.83-2.83l-.06-.06A1.65 1.65 0 0 0 4.68 15a1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 1 1 2.83-2.83l.06.06a1.65 1.65 0 0 0 1.82.33V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 1 1 2.83 2.83l-.06-.06A1.65 1.65 0 0 0 19.4 9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z\"/></svg><span>设置</span></button>\n  </div>\n</div>\n<div class=\"settings-mask\" id=\"settingsMask\"></div>\n<div class=\"settings-panel\" id=\"settingsPanel\">\n  <div class=\"panel-handle\"></div>\n  <div class=\"setting-row\"><span class=\"setting-label\">字号</span>\n    <div class=\"font-controls\"><button id=\"fontDec\">A-</button><span class=\"font-size-val\" id=\"fontSizeVal\">18</span><button id=\"fontInc\">A+</button></div>\n  </div>\n  <div class=\"setting-row\"><span class=\"setting-label\">行距</span>\n    <div class=\"spacing-controls\" id=\"spacingBtns\"><button data-val=\"1.5\">紧凑</button><button data-val=\"1.9\" class=\"active\">适中</button><button data-val=\"2.4\">宽松</button></div>\n  </div>\n  <div class=\"setting-row\"><span class=\"setting-label\">背景</span>\n    <div class=\"theme-options\" id=\"themeDots\"><div class=\"theme-dot dot-white\" data-theme=\"white\"></div><div class=\"theme-dot dot-warm active\" data-theme=\"warm\"></div><div class=\"theme-dot dot-green\" data-theme=\"green\"></div><div class=\"theme-dot dot-dark\" data-theme=\"dark\"></div></div>\n  </div>\n</div>\n<!-- 白名单面板 -->\n<div class=\"panel-extra\" id=\"whitelistPanel\">\n  <div class=\"panel-handle\"></div>\n  <div class=\"panel-header\"><span>白名单网站</span><button class=\"panel-close\" id=\"whitelistClose\">✕</button></div>\n  <div class=\"panel-list-wrap\">\n    <div class=\"fade-mask top hidden\" id=\"wlFadeTop\"></div>\n    <div class=\"panel-list\" id=\"whitelistList\"><div class=\"panel-empty\">暂无白名单</div></div>\n    <div class=\"fade-mask bottom hidden\" id=\"wlFadeBottom\"></div>\n  </div>\n</div>\n<!-- 历史记录面板 -->\n<div class=\"panel-extra\" id=\"historyPanel\">\n  <div class=\"panel-handle\"></div>\n  <div class=\"panel-header\"><span>阅读历史</span><button class=\"panel-close\" id=\"historyClose\">✕</button></div>\n  <div class=\"panel-list-wrap\">\n    <div class=\"fade-mask top hidden\" id=\"histFadeTop\"></div>\n    <div class=\"panel-list\" id=\"historyList\"><div class=\"panel-empty\">暂无历史记录</div></div>\n    <div class=\"fade-mask bottom hidden\" id=\"histFadeBottom\"></div>\n  </div>\n</div>\n<!-- 净化词面板（列表可上下滑动） -->\n<div class=\"panel-extra\" id=\"purifyPanel\">\n  <div class=\"panel-handle\"></div>\n  <div class=\"panel-header\"><span>净化词</span><button class=\"panel-close\" id=\"purifyClose\">✕</button></div>\n  <div class=\"panel-input-row\" style=\"display:flex;gap:6px;padding:0 14px 10px;flex:none;\">\n    <input id=\"purifyInput\" placeholder=\"输入净化词，多个用、分隔\" style=\"flex:1;min-width:0;padding:8px 10px;border:1px solid rgba(128,128,128,.4);border-radius:8px;background:transparent;color:inherit;font-size:13px;outline:none;\"/>\n    <button id=\"purifyAddBtn\" style=\"padding:0 16px;border:none;border-radius:8px;background:#d9822b;color:#fff;cursor:pointer;font-size:13px;flex:none;\">添加</button>\n  </div>\n  <div id=\"purifyHelp\" style=\"margin:0 14px 10px;padding:9px 11px;border-radius:8px;background:rgba(128,128,128,.12);font-size:11px;line-height:1.8;color:inherit;flex:none;opacity:.9;\"><b>净化说明（阅读和下载TXT都会生效）</b><br>1. 整句清除：正文出现净化词，就把它连着的整句删掉——词前面连着的字、词本身、后面连着的字和句末标点（。！？…）全清；前后若遇到标点就停，标点另一侧的字不删。例：删“广告”，句子“本书由广告赞助。”整句消失。<br>2. 一次加多个词：用<span style=\"color:#ff4d4f;font-weight:700;\">、</span>隔开即可。例：广告<span style=\"color:#ff4d4f;font-weight:700;\">、</span>加群<span style=\"color:#ff4d4f;font-weight:700;\">、</span>扫码。<br>3. 只想删词、不误删旁边的字：在词前或词后加<span style=\"color:#ff4d4f;font-weight:700;\">/</span>。词前加<span style=\"color:#ff4d4f;font-weight:700;\">/</span>（如<span style=\"color:#ff4d4f;font-weight:700;\">/</span>广告）=左边的字不误删；词后加<span style=\"color:#ff4d4f;font-weight:700;\">/</span>（如广告<span style=\"color:#ff4d4f;font-weight:700;\">/</span>）=右边的字和句末标点都不误删；两边都加<span style=\"color:#ff4d4f;font-weight:700;\">/</span>（如<span style=\"color:#ff4d4f;font-weight:700;\">/</span>广告<span style=\"color:#ff4d4f;font-weight:700;\">/</span>）=只删“广告”二字，最保险。<br>4. 英文单词不怕被切开：夹在字母中间的<span style=\"color:#ff4d4f;font-weight:700;\">/</span>和<span style=\"color:#ff4d4f;font-weight:700;\">.</span>算单词的一部分（如 a<span style=\"color:#ff4d4f;font-weight:700;\">/</span>b、U<span style=\"color:#ff4d4f;font-weight:700;\">.</span>S<span style=\"color:#ff4d4f;font-weight:700;\">.</span> 不会被切断），没夹在字母里只当普通标点；净化词本身是英文时，它紧挨着的<span style=\"color:#ff4d4f;font-weight:700;\">/</span>和<span style=\"color:#ff4d4f;font-weight:700;\">.</span>也会一并清除。<br>5. 删除词：点词条右侧的<span style=\"color:#ff4d4f;font-weight:700;\">✕</span>即可。</div>\n  <div class=\"panel-list-wrap\">\n    <div class=\"fade-mask top hidden\" id=\"pfFadeTop\"></div>\n    <div class=\"panel-list\" id=\"purifyList\"><div class=\"panel-empty\">暂无净化词</div></div>\n    <div class=\"fade-mask bottom hidden\" id=\"pfFadeBottom\"></div>\n  </div>\n</div>\n<div class=\"settings-mask\" id=\"extraMask\" style=\"display:none;z-index:210;\"></div>";

  /* ==================== iframe 阅读器脚本（含图片过滤和拦截） ==================== */
  var SHARED_SRC = [showToastIn, getBookRootKey, chineseToNumber, romanToNumber, parseChapterNumber, pickChapterNumber,
    isPunctChar, isEnglishWord, isEngLetter, parsePurifyWord, markPurifyRun, purifyText, purifyDomElement, purifyHtml,
    normReaderUrl, tocTitleForUrl]
    .map(function (f) { return f.toString(); }).join('\n');

  function iframeMain() {
    var m = document.getElementById('topbar'), h = document.getElementById('bottombar'), e = document.getElementById('overlay'),
        E = document.getElementById('contentWrapper'), g = document.getElementById('articleContainer'), f = document.getElementById('chaptersHost'),
        p = document.getElementById('loadingTip'), v = document.getElementById('barTitle'), b = document.getElementById('fontSizeVal'),
        y = document.getElementById('stitchLoadingNext'), n = document.getElementById('catalogSidebar'), r = document.getElementById('catalogMask'),
        _ = document.getElementById('catalogList'), btnLoadToc = document.getElementById('btnLoadToc'),
        btnDownloadAll = document.getElementById('btnDownloadAll'),
        tocProgress = document.getElementById('tocProgress'),
        loadingText = document.getElementById('loadingText');

    var STR = {
      readerMode: '阅读模式', chapters: '目录', noChapters: '暂无目录',
      loading: '正在加载内容...', loadingJump: '正在加载章节...', loadingNext: '正在加载下一章...',
      nextChapter: '下一章', loadFail: '章节加载失败', tocLoaded: '已加载目录',
      night: '夜间', day: '日间', download: '下载全部', downloading: '正在下载...'
    };
    document.title = STR.readerMode;
    loadingText.textContent = STR.loading;

    var C = [], d = 0;
    var o = false, G = false;
    var stitching = false, awaitingNextUrl = '', stitchFails = 0;
    var tocData = [], tocUrl = '';
    var tocLoading = false;
    var s = { fontSize: 18, lineHeight: 1.9, theme: 'warm' };
    var currentBookKey = '';
    var currentBookTitle = '';
    var currentHost = '';
    var isComicMode = false;
    var selectMode = false, dlRunning = false, selectedUrls = {};
    var selectToolbar = null;
    var markActivePrev = null;
    var lastScrollTop = 0;
    var scrollTicking = false;
    var extraVisible = false;
    var extraMask = document.getElementById('extraMask');
    var purifyWords = [];
    var whitelistPanel = document.getElementById('whitelistPanel');
    var historyPanel = document.getElementById('historyPanel');
    var btnNight = document.getElementById('btnNightMode');
    var Y = document.getElementById('settingsPanel'), j = document.getElementById('settingsMask');

    function toast(msg) {
      showToastIn(document, '__reader_toast__', msg, 'position:fixed;top:18%;left:50%;transform:translateX(-50%);z-index:999;background:rgba(0,0,0,.72);color:#fff;font-size:13px;line-height:1.5;padding:9px 16px;border-radius:18px;pointer-events:none;', 2200);
    }

    // ====================== 图片过滤函数 ======================
    function filterImages(container) {
      var imgs = container.querySelectorAll('img');
      imgs.forEach(function(img) {
        var src = img.getAttribute('src') || img.getAttribute('data-src') || '';
        if (/\.gif(\?.*)?$/i.test(src)) {
          img.remove();
          return;
        }
        if (img.complete && img.naturalWidth > 0) {
          if (img.naturalWidth > img.naturalHeight) {
            img.remove();
          }
          return;
        }
        img.addEventListener('load', function() {
          if (this.naturalWidth > this.naturalHeight) {
            this.remove();
          }
        });
        img.addEventListener('error', function() {
          this.remove();
        });
      });
    }

    function getHighlightColor() {
      switch (s.theme) {
        case 'white': return '#e6f2ff';
        case 'warm':  return '#e8ddc8';
        case 'green': return '#c5e1c8';
        case 'dark':  return '#3a4a5a';
        default:      return '#e6f2ff';
      }
    }

    function send(msg) { try { window.parent.postMessage(msg, '*'); } catch (err) {} }
    function sendCurrent(url, title) {
      send({ type: 'setCurrentUrl', url: url || '', title: title || '', bookKey: currentBookKey, bookTitle: currentBookTitle });
    }
    // ====== 阅读器内部日志转发：把 iframe 内的 console/异常转发给父页面诊断日志 ======
    function forwardDiag(level, msg) {
      try {
        var text = (typeof msg === 'string') ? msg : (function () { try { return JSON.stringify(msg); } catch (e) { return String(msg); } })();
        if (text.length > 600) text = text.slice(0, 600) + '…';
        send({ type: '__diag', level: level, msg: text });
      } catch (e) {}
    }
    try {
      ['log', 'info', 'warn', 'error', 'debug'].forEach(function (m) {
        var orig = console[m];
        if (typeof orig !== 'function') return;
        console[m] = function () {
          try {
            var args = Array.prototype.slice.call(arguments);
            var text = args.map(function (a) { return (typeof a === 'string') ? a : (function () { try { return JSON.stringify(a); } catch (e) { return String(a); } })(); }).join(' ');
            if (m === 'error' || m === 'warn' || text.charAt(0) === '[') forwardDiag(m.toUpperCase(), text);
          } catch (e) {}
          return orig.apply(console, arguments);
        };
      });
      window.addEventListener('error', function (ev) {
        forwardDiag('ERROR', 'iframe window.onerror: ' + (ev.message || '') + ' @ ' + (ev.filename || '') + ':' + (ev.lineno || ''));
      }, true);
    } catch (e) {}

    window.addEventListener('message', function (ev) {
      var msg = ev.data;
      if (!msg || typeof msg !== 'object' || !msg.type) return;
      handleMessage(msg);
    });

    function handleMessage(msg) {
      switch (msg.type) {
        case 'init':
  if (msg.settings && typeof msg.settings === 'object') {
    if (msg.settings.fontSize) s.fontSize = msg.settings.fontSize;
    if (msg.settings.lineHeight) s.lineHeight = msg.settings.lineHeight;
    if (msg.settings.theme) s.theme = msg.settings.theme;
  }
  currentBookKey = msg.bookKey || '';
  currentBookTitle = msg.bookTitle || '';
  currentHost = msg.host || '';
  isComicMode = !!msg.isComic;
  if (Array.isArray(msg.purify)) purifyWords = msg.purify;
  applySettings();

  // ====== 新增：内联图片高度限制（仅小说模式） ======
  if (!isComicMode) {
    var style = document.createElement('style');
    style.id = 'inline-img-style';
    style.textContent = `
      .chapter-content p img {
        max-height: 1.6em;
        vertical-align: middle;
        margin: 0 2px;
      }
    `;
    document.head.appendChild(style);
  }

  tocData = msg.toc || [];
  tocUrl = msg.tocUrl || '';
  btnLoadToc.style.display = tocUrl ? '' : 'none';
  if (msg.chapter) {
    if (isComicMode && msg.images && msg.images.length) {
      renderComicImages(msg.images, msg.chapter.title);
    } else {
      J(msg.chapter, true);
    }
    I(msg.chapter);
  }
  updateTocUI();
  refreshRenderedTitles();
  // 目录提前加载：一切换到阅读模式界面即开始抓取目录，无需等点击右上角三条横杠图标。
  // 受 tocLoading 保护，不会与打开目录时的延迟触发重复抓取。
  if (tocUrl && (!tocData || tocData.length === 0) && !tocLoading) {
    startTocFetch();
  }
  break;
        case 'setBookInfo':
  currentBookKey = msg.bookKey || currentBookKey;
  currentBookTitle = msg.bookTitle || currentBookTitle;
  if (typeof updateTocUI === 'function') updateTocUI();
  break;
        case 'chapterReady':
          y.classList.remove('visible');
          if (msg.mode === 'jump') {
            hideLoading();
            if (isComicMode && msg.chapter.images && msg.chapter.images.length) {
              renderComicImages(msg.chapter.images, msg.chapter.title);
            } else {
              resetAndLoad(msg.chapter);
            }
          } else {
            if (awaitingNextUrl && msg.url === awaitingNextUrl) {
              awaitingNextUrl = '';
              stitching = false;
              if (isComicMode && msg.chapter.images && msg.chapter.images.length) {
                appendComicImages(msg.chapter.images);
              } else {
                J(msg.chapter, false);
              }
              stitchFails = 0;
              setTimeout(checkAutoLoad, 0);
            } else {
              try { console.warn('[阅读模式] 自动加载状态异常：等待', awaitingNextUrl || '(空)', '但收到', msg.url || '(空)'); } catch (e1) {}
            }
          }
          break;
        case 'chapterFailed':
          y.classList.remove('visible');
          if (msg.mode === 'jump') { hideLoading(); toast(STR.loadFail + (msg.reason ? '：' + msg.reason : '')); }
          else { stitching = false; awaitingNextUrl = ''; stitchFails++; if (stitchFails < 3) setTimeout(checkAutoLoad, 2000); else { try { toast('下一页加载失败：' + (msg.reason || '')); } catch (e1) {} } try { console.warn('[阅读模式] 章节自动加载失败(第' + (stitchFails) + '次):', msg.url || '', msg.reason || ''); } catch (e1) {} }
          break;
        case 'tocReady':
          tocData = msg.toc || [];
          tocLoading = false;
          resetTocBtn();
          renderCatalog();
          updateTocUI();
          refreshRenderedTitles();
          if (n.classList.contains('visible')) scrollActiveIntoCenter();
          break;
        case 'tocProgress':
          if (tocProgress.style.display !== 'none') {
            tocProgress.textContent = '已获取 ' + (msg.count || 0) + ' 章';
          }
          break;
        case 'whitelistData':
          renderWhitelist(msg.list || []);
          break;
        case 'purifyUpdate':
          purifyWords = Array.isArray(msg.purify) ? msg.purify : [];
          (function () {
            var cs = f.querySelectorAll('.chapter-content');
            for (var pi = 0; pi < cs.length; pi++) purifyDomElement(cs[pi], purifyWords);
          })();
          break;
        case 'purifyData':
          renderPurify(msg.list || []);
          break;
        case 'historyData':
          renderHistory(msg.list || []);
          break;
        case 'downloadStopping':
          break;
        case 'downloadComplete':
          resetDlBtn();
          toast('下载完成！');
          break;
        case 'downloadPaused':
          resetDlBtn();
          toast('已停止下载，保存了 ' + msg.current + ' 章');
          break;
        case 'downloadProgress':
          btnDownloadAll.textContent = '下载中 ' + msg.current + '/' + msg.total;
          break;
      }
    }

    function showContent(title) {
      v.textContent = title || STR.readerMode;
      p.style.display = 'none';
      g.style.display = 'block';
    }
    function showLoading(text) {
      loadingText.textContent = text || STR.loading;
      p.style.display = 'flex';
      g.style.display = 'none';
    }
    function hideLoading() { p.style.display = 'none'; g.style.display = 'block'; }
    function hideBars() {
      o = false;
      m.classList.remove('visible');
      h.classList.remove('visible');
      e.classList.remove('visible');
    }

    function makeComicImg(src, alt) {
      var imgEl = document.createElement('img');
      imgEl.src = src;
      imgEl.alt = alt;
      imgEl.style.cssText = 'max-width:100%;height:auto;display:block;border-radius:4px;box-shadow:0 2px 8px rgba(0,0,0,.1);';
      return imgEl;
    }

    function renderComicImages(images, title) {
      f.innerHTML = '';
      var container = document.createElement('div');
      container.className = 'comic-page';
      container.style.cssText = 'display:flex;flex-direction:column;align-items:center;gap:16px;';
      images.forEach(function (img) {
        container.appendChild(makeComicImg(img.src, img.alt || title || '漫画'));
      });
      f.appendChild(container);
      filterImages(container);
      showContent(title);
      E.scrollTop = 0;
      sendCurrent(location.href, title);
    }

    function appendComicImages(images) {
      var container = f.querySelector('.comic-page');
      if (!container) { renderComicImages(images, ''); return; }
      images.forEach(function (img) {
        container.appendChild(makeComicImg(img.src, img.alt || ''));
      });
      filterImages(container);
      E.scrollTop = E.scrollHeight;
    }

    function sanitize(el) {
      var bad = el.querySelectorAll('script,iframe,object,embed,link,meta,form,input,button,select,textarea');
      for (var i = 0; i < bad.length; i++) { try { bad[i].parentNode.removeChild(bad[i]); } catch (e2) {} }
    }

    // 去掉章节标题里的分页页码后缀（（2/3）、（第2页）、第2页 等）
    function stripPageSuffix(t) {
      return String(t || '')
        .replace(/[（(【\[]\s*第?\s*[0-9一二三四五六七八九十百千]+\s*\/\s*[0-9一二三四五六七八九十百千]+\s*页?\s*[）)】\]]/g, '')
        .replace(/[（(【\[]\s*第\s*[0-9一二三四五六七八九十百千万亿两]+\s*页\s*[）)】\]]/g, '')
        .replace(/第\s*[0-9一二三四五六七八九十百千万亿两]+\s*页$/g, '')
        .replace(/\s+/g, '')
        .trim();
    }
    // 判断两个标题是否属于同一章节（分页标题：第1章 vs 第1章（2/3））
    function sameChapterTitle(a, b) {
      if (!a || !b) return false;
      var ca = String(a).replace(/\s+/g, '').trim();
      var cb = String(b).replace(/\s+/g, '').trim();
      if (!ca || !cb) return false;
      if (ca === cb) return true;
      var n1 = parseChapterNumber(ca);
      var n2 = parseChapterNumber(cb);
      if (n1 !== null && n2 !== null && n1 === n2) return true;
      var ra = stripPageSuffix(ca);
      var rb = stripPageSuffix(cb);
      return ra.length > 0 && ra === rb;
    }
    function J(t, first) {
      if (!t || !t.url) return;
      // 正文章节名优先取“目录页抓取的章节名”（URL 匹配或章节号兜底），未命中才回退正文页 title
      var dispTitle = tocTitleForUrl(tocData, t.url, t.title) || t.title || '';
      // 同一章节的分页：直接并入上一章块，不再重复渲染章节标题/分隔线（仅章节首页分页保留标题）
      var prev = C.length ? C[C.length - 1] : null;
      var isPage = !first && prev && sameChapterTitle(prev.title, dispTitle);
      if (isPage) {
        var cont = prev.element.querySelector('.chapter-content');
        if (cont) {
          var tmp = document.createElement('div');
          tmp.innerHTML = purifyHtml(t.data || '', purifyWords);
          sanitize(tmp);
          filterImages(tmp);
          while (tmp.firstChild) cont.appendChild(tmp.firstChild);
          var imgs = tmp.querySelectorAll('img[data-src]');
          for (var i = 0; i < imgs.length; i++) {
            (function (img) {
              var src = img.getAttribute('data-src');
              if (!src) return;
              var im = new Image();
              im.onload = function () { img.src = src; img.removeAttribute('data-src'); };
              im.onerror = function () { img.removeAttribute('data-src'); };
              im.src = src;
            })(imgs[i]);
          }
        }
        prev.url = t.url || prev.url;
        prev.nextUrl = t.next_url || prev.nextUrl;
        renderCatalog();
        return;
      }
      var block = document.createElement('div');
      block.className = 'chapter-block';
      block.dataset.url = t.url || '';
      if (!first) {
        var divider = document.createElement('div');
        divider.className = 'chapter-divider';
        var dt = document.createElement('span');
        dt.className = 'chapter-divider-title';
        dt.textContent = dispTitle || STR.nextChapter;
        divider.appendChild(dt);
        block.appendChild(divider);
      }
      var titleEl = document.createElement('div');
      titleEl.className = 'chapter-title';
      titleEl.textContent = dispTitle;
      titleEl.style.fontSize = (s.fontSize + 4) + 'px';
      block.appendChild(titleEl);
      var contentEl = document.createElement('div');
      contentEl.className = 'chapter-content';
      contentEl.style.fontSize = s.fontSize + 'px';
      contentEl.style.lineHeight = s.lineHeight;
      contentEl.innerHTML = purifyHtml(t.data || '', purifyWords);
      sanitize(contentEl);
      filterImages(contentEl);
      block.appendChild(contentEl);
      f.appendChild(block);
      C.push({ url: t.url, title: dispTitle, nextUrl: t.next_url || '', element: block });
      var imgs = block.querySelectorAll('img[data-src]');
      for (var i = 0; i < imgs.length; i++) {
        (function (img) {
          var src = img.getAttribute('data-src');
          if (!src) return;
          var im = new Image();
          im.onload = function () { img.src = src; img.removeAttribute('data-src'); };
          im.onerror = function () { img.removeAttribute('data-src'); };
          im.src = src;
        })(imgs[i]);
      }
      if (first) {
        d = 0;
        showContent(dispTitle);
        E.scrollTop = 0;
        sendCurrent(t.url, dispTitle);
      }
      renderCatalog();
    }

    // 目录加载完成后，把已渲染章节块的标题/分隔线/顶栏统一刷新为目录页章节名
    function refreshRenderedTitles() {
      var i, item, tocT, blk, tEl, dEl;
      for (i = 0; i < C.length; i++) {
        item = C[i];
        tocT = tocTitleForUrl(tocData, item.url, item.title);
        if (!tocT || tocT === item.title) continue;
        item.title = tocT;
        blk = item.element;
        if (!blk) continue;
        tEl = blk.querySelector('.chapter-title');
        if (tEl) tEl.textContent = tocT;
        dEl = blk.querySelector('.chapter-divider-title');
        if (dEl) dEl.textContent = tocT;
      }
      if (C.length && C[d]) {
        v.textContent = C[d].title || STR.readerMode;
        sendCurrent(C[d].url, C[d].title);
      }
    }

    function I(t) { if (t && t.next_url) M(t.url, t.next_url); }
    function findLoadedByUrl(url) {
      if (!url) return -1;
      for (var i = 0; i < C.length; i++) if (C[i].url === url) return i;
      return -1;
    }
    function M(fromUrl, nextUrl) {
      if (!nextUrl || stitching) return;
      if (findLoadedByUrl(nextUrl) !== -1) return;
      stitching = true;
      awaitingNextUrl = nextUrl;
      y.classList.add('visible');
      send({ type: 'fetchChapter', url: nextUrl, from: fromUrl, mode: 'stitch' });
    }
    function resetAndLoad(chapter) {
      C = []; d = 0;
      f.innerHTML = '';
      stitching = false;
      awaitingNextUrl = '';
      stitchFails = 0;
      y.classList.remove('visible');
      J(chapter, true);
      I(chapter);
      E.scrollTop = 0;
    }

    function updateTocUI() {
      if (tocLoading) {
        btnDownloadAll.style.display = 'none';
        tocProgress.style.display = 'inline';
        var count = tocData ? tocData.length : 0;
        tocProgress.textContent = count > 0 ? '已获取 ' + count + ' 章' : '加载中...';
      } else {
        btnDownloadAll.style.display = '';
        tocProgress.style.display = 'none';
      }
    }
    function setTocBtnStopping() {
      btnLoadToc.textContent = '停止';
      btnLoadToc.style.opacity = '1';
      btnLoadToc.style.pointerEvents = 'auto';
      btnLoadToc.style.cursor = 'pointer';
    }
    function resetTocBtn() {
      btnLoadToc.textContent = '加载目录页';
      btnLoadToc.style.opacity = '';
      btnLoadToc.style.pointerEvents = '';
      btnLoadToc.style.cursor = '';
    }
    function startTocFetch() {
      tocLoading = true;
      updateTocUI();
      setTocBtnStopping();
      send({ type: 'fetchToc', url: tocUrl });
    }

    function catalogItems() {
      if (tocData && tocData.length) return tocData;
      return C.map(function (c, i) { return { title: c.title || ('章节 ' + (i + 1)), url: c.url }; });
    }
    function currentUrl() { return C.length && C[d] ? C[d].url : ''; }

    function renderCatalog() {
      _.innerHTML = '';
      var items = catalogItems();
      if (!items.length) {
        _.innerHTML = '<div class="catalog-empty">' + STR.noChapters + '</div>';
        return;
      }
      var seen = {}, unique = [];
      items.forEach(function (it) {
        if (!it.url) return;
        if (seen[it.url]) return;
        seen[it.url] = true;
        unique.push(it);
      });
      items = unique;
      var cur = currentUrl();
      var hasVolumeAndChapter = items.some(function (it) {
        var t = it.title || '';
        return /卷.*章/.test(t);
      });

      function createItem(it, isActive) {
        var el = document.createElement('div');
        el.className = 'catalog-item' + (isActive ? ' active' : '');
        if (it.url) el.dataset.tocUrl = it.url;
        if (selectMode) {
          el.style.display = 'flex';
          el.style.alignItems = 'center';
          var cb = document.createElement('input');
          cb.type = 'checkbox';
          cb.className = 'dl-check';
          cb.dataset.dlUrl = it.url || '';
          cb.checked = !!selectedUrls[it.url];
          cb.style.cssText = 'margin:0 8px 0 0;flex:none;width:16px;height:16px;cursor:pointer;';
          cb.addEventListener('click', function (ev) { ev.stopPropagation(); });
          cb.addEventListener('change', function () {
            if (cb.checked) selectedUrls[it.url] = true; else delete selectedUrls[it.url];
            updateSelCount();
          });
          el.appendChild(cb);
          el.appendChild(document.createTextNode(it.title));
          el.addEventListener('click', function () {
            cb.checked = !cb.checked;
            if (cb.checked) selectedUrls[it.url] = true; else delete selectedUrls[it.url];
            updateSelCount();
          });
          return el;
        }
        el.textContent = it.title;
        el.addEventListener('click', function () {
          closeCatalog();
          var idx = findLoadedByUrl(it.url);
          if (idx >= 0) {
            var c = C[idx];
            if (c && c.element) {
              c.element.scrollIntoView({ behavior: 'smooth', block: 'start' });
              d = idx;
              v.textContent = c.title || STR.readerMode;
              sendCurrent(c.url, c.title);
              markActive();
            }
          } else if (it.url) {
            showLoading(STR.loadingJump);
            send({ type: 'fetchChapter', url: it.url, mode: 'jump' });
          }
        });
        return el;
      }

      var frag = document.createDocumentFragment();
      if (hasVolumeAndChapter) {
        items.forEach(function (it) {
          frag.appendChild(createItem(it, it.url === cur));
        });
        _.appendChild(frag);
        markActive();
        return;
      }

      var normal = [], special = [];
      items.forEach(function (it) {
        var num = parseChapterNumber(it.title);
        if (num !== null && num > 0) {
          normal.push({ item: it, num: num });
        } else {
          special.push(it);
        }
      });
      normal.sort(function (a, b) { return a.num - b.num; });
      normal.forEach(function (o2) {
        frag.appendChild(createItem(o2.item, o2.item.url === cur));
      });
      if (special.length) {
        var toggleBtn = document.createElement('div');
        toggleBtn.className = 'catalog-toggle';
        toggleBtn.textContent = '▼ 其他章节 (' + special.length + ')';
        toggleBtn.style.cssText = 'padding:8px 20px;font-size:13px;opacity:.6;cursor:pointer;border-top:1px solid rgba(128,128,128,.2);margin-top:8px;user-select:none;';
        toggleBtn.addEventListener('click', function (ev) {
          ev.stopPropagation();
          var container = this.nextElementSibling;
          if (container.style.display === 'none') {
            container.style.display = 'block';
            this.textContent = '▲ 其他章节 (' + special.length + ')';
          } else {
            container.style.display = 'none';
            this.textContent = '▼ 其他章节 (' + special.length + ')';
          }
        });
        frag.appendChild(toggleBtn);
        var specialContainer = document.createElement('div');
        specialContainer.className = 'special-chapters';
        specialContainer.style.display = 'none';
        special.forEach(function (it) {
          specialContainer.appendChild(createItem(it, it.url === cur));
        });
        frag.appendChild(specialContainer);
      }
      _.appendChild(frag);
      markActive();
    }

    // 目录条目与当前章节是否对应：URL 归一化等价，或章节号一致（目录/正文 URL 可能不一致）
    function isSameTocEntry(tocUrl, tocTitle, curUrl, curTitle) {
      if (curUrl && tocUrl) {
        var t = normReaderUrl(tocUrl), c = normReaderUrl(curUrl);
        if (t && c && (t[0] === c[0] || t[0] === c[1] || t[1] === c[0] || t[1] === c[1])) return true;
      }
      if (curTitle && tocTitle) {
        var bn = parseChapterNumber(curTitle);
        if (bn !== null && bn > 0) {
          var tn = parseChapterNumber(tocTitle);
          if (tn !== null && tn === bn) return true;
        }
      }
      return false;
    }
    function markActive() {
      var cur = currentUrl();
      var curTitle = (C.length && C[d]) ? (C[d].title || '') : '';
      var hit = null;
      if (cur || curTitle) {
        var items = _.querySelectorAll('.catalog-item');
        for (var i = 0; i < items.length; i++) {
          if (isSameTocEntry(items[i].dataset.tocUrl || '', items[i].textContent || '', cur, curTitle)) {
            hit = items[i]; break;
          }
        }
      }
      if (hit === markActivePrev) return;
      if (markActivePrev) { try { markActivePrev.classList.remove('active'); } catch (e) {} }
      markActivePrev = null;
      var old = _.querySelector('.catalog-item.active');
      if (old && old !== hit) { try { old.classList.remove('active'); } catch (e) {} }
      if (hit) { hit.classList.add('active'); markActivePrev = hit; }
    }
    // 打开目录时：把当前章节的高亮项滚动到可视区居中；若它在折叠的“其他章节”分组里先展开
    function scrollActiveIntoCenter() {
      var act = _.querySelector('.catalog-item.active');
      if (!act) return;
      var sp = act.parentElement;
      while (sp && sp !== _ && !(sp.classList && sp.classList.contains('special-chapters'))) sp = sp.parentElement;
      if (sp && sp !== _ && sp.style.display === 'none') {
        sp.style.display = 'block';
        var tg = sp.previousElementSibling;
        if (tg && tg.classList && tg.classList.contains('catalog-toggle')) {
          tg.textContent = '▲ 其他章节 (' + sp.children.length + ')';
        }
      }
      var r = act.getBoundingClientRect(), lr = _.getBoundingClientRect();
      var cur = r.top - lr.top;
      var want = (lr.height - r.height) / 2;
      _.scrollTop += (cur - want);
    }
    function openCatalog() {
      renderCatalog();
      n.classList.add('visible');
      r.classList.add('visible');
      hideBars();
      scrollActiveIntoCenter();
      if (tocData.length === 0 && tocUrl && !tocLoading) startTocFetch();
    }
    function closeCatalog() { n.classList.remove('visible'); r.classList.remove('visible'); }

    function checkAutoLoad() {
      if (C.length === 0 || stitching) return;
      if (E.scrollHeight - (E.scrollTop + E.clientHeight) < 800) {
        var last = C[C.length - 1];
        if (last && last.nextUrl) M(last.url, last.nextUrl);
      }
    }
    function onScroll() {
      var st = E.scrollTop;
      if (Math.abs(st - lastScrollTop) > 2 && o) {
        o = false;
        m.classList.remove('visible');
        h.classList.remove('visible');
      }
      lastScrollTop = st;
      checkAutoLoad();
      for (var i = C.length - 1; i >= 0; i--) {
        if (C[i].element.getBoundingClientRect().top <= 80) {
          if (d !== i) {
            d = i;
            v.textContent = C[i].title || STR.readerMode;
            sendCurrent(C[i].url, C[i].title);
            markActive();
          }
          break;
        }
      }
    }
    E.addEventListener('scroll', function () {
      if (scrollTicking) return;
      scrollTicking = true;
      requestAnimationFrame(function () { scrollTicking = false; onScroll(); });
    });

    function toggleBars() {
      if (G) { closeSettings(); return; }
      if (n.classList.contains('visible')) { closeCatalog(); return; }
      if (extraVisible) { closeExtraPanel(); return; }
      o = !o;
      m.classList.toggle('visible', o);
      h.classList.toggle('visible', o);
    }

    E.addEventListener('click', function (ev) {
      var aEl = (ev.target && ev.target.closest) ? ev.target.closest('a') : null;
      if (aEl) { ev.preventDefault(); return; }
      if (o || G) { toggleBars(); return; }
      var rect = E.getBoundingClientRect();
      var yy = ev.clientY - rect.top, hh = rect.height, step = hh - 40;
      if (yy < hh * 0.3) E.scrollBy({ top: -step, behavior: 'smooth' });
      else if (yy > hh * 0.7) E.scrollBy({ top: step, behavior: 'smooth' });
      else toggleBars();
    });
    e.addEventListener('click', function () { toggleBars(); });

    document.getElementById('btnBack').addEventListener('click', function (ev) {
      ev.stopPropagation();
      send({ type: 'exit' });
    });
    document.getElementById('btnCatalog').addEventListener('click', function (ev) { ev.stopPropagation(); openCatalog(); });
    r.addEventListener('click', function () { closeCatalog(); });

    btnLoadToc.addEventListener('click', function (ev) {
      ev.stopPropagation();
      if (!tocUrl) return;
      if (tocLoading) {
        send({ type: 'stopFetchToc' });
        return;
      }
      startTocFetch();
    });

    function catalogMap() {
      var map = {};
      catalogItems().forEach(function (it) { if (it.url) map[it.url] = it.title || it.url; });
      return map;
    }
    function allChecks() { return Array.prototype.slice.call(_.querySelectorAll('.dl-check')); }
    function countSelected() { var cnt = 0; allChecks().forEach(function (c) { if (c.checked) cnt++; }); return cnt; }

    function updateSelCount() {
      var nSel = countSelected();
      var btn = document.getElementById('dlSelStart');
      if (btn) btn.textContent = '开始下载 (' + nSel + ')';
      var all = document.getElementById('dlSelAll');
      if (all) {
        var checks = allChecks();
        all.checked = checks.length > 0 && nSel === checks.length;
      }
    }

    function toggleAllChecks(on) {
      allChecks().forEach(function (cb) {
        cb.checked = on;
        if (on) selectedUrls[cb.dataset.dlUrl] = true; else delete selectedUrls[cb.dataset.dlUrl];
      });
      updateSelCount();
    }

    function selectRange(a, b) {
      var checks = allChecks();
      toggleAllChecks(false);
      var i0 = Math.max(1, a) - 1;
      var i1 = Math.min(checks.length, b);
      for (var i = i0; i < i1; i++) {
        checks[i].checked = true;
        selectedUrls[checks[i].dataset.dlUrl] = true;
      }
      updateSelCount();
    }

     function resetDlBtn() {
      dlRunning = false;
      btnDownloadAll.textContent = '下载全部';
      btnDownloadAll.disabled = false;
     }

    function removeSelectToolbar() {
      if (selectToolbar && selectToolbar.parentNode) selectToolbar.parentNode.removeChild(selectToolbar);
      selectToolbar = null;
    }

    function mkDlBtn(text, primary) {
      var btn = document.createElement('button');
      btn.textContent = text;
      btn.style.cssText = primary
        ? 'padding:5px 12px;border:none;border-radius:6px;background:#d9822b;color:#fff;cursor:pointer;font-size:12px;font-weight:500;'
        : 'padding:5px 10px;border:1px solid rgba(128,128,128,.4);border-radius:6px;background:transparent;cursor:pointer;font-size:12px;color:inherit;';
      return btn;
    }

    function buildSelectToolbar() {
      removeSelectToolbar();
      var tb = document.createElement('div');
      tb.id = 'dlSelectToolbar';
      tb.style.cssText = 'padding:8px 12px;border-bottom:1px solid rgba(128,128,128,.25);display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:13px;flex:none;';

      var lab = document.createElement('label');
      lab.style.cssText = 'display:flex;align-items:center;gap:4px;cursor:pointer;';
      var cbAll = document.createElement('input');
      cbAll.type = 'checkbox';
      cbAll.id = 'dlSelAll';
      cbAll.style.cssText = 'width:15px;height:15px;cursor:pointer;';
      cbAll.addEventListener('change', function () { toggleAllChecks(cbAll.checked); });
      lab.appendChild(cbAll);
      lab.appendChild(document.createTextNode('全选'));
      tb.appendChild(lab);

      var sp1 = document.createElement('span'); sp1.textContent = '从'; tb.appendChild(sp1);
      var inpFrom = document.createElement('input');
      inpFrom.type = 'number'; inpFrom.min = '1'; inpFrom.value = '1';
      inpFrom.style.cssText = 'width:54px;padding:3px 4px;border:1px solid rgba(128,128,128,.4);border-radius:4px;background:transparent;color:inherit;font-size:12px;';
      tb.appendChild(inpFrom);
      var sp2 = document.createElement('span'); sp2.textContent = '到'; tb.appendChild(sp2);
      var inpTo = document.createElement('input');
      inpTo.type = 'number'; inpTo.min = '1'; inpTo.value = '1';
      inpTo.style.cssText = inpFrom.style.cssText;
      tb.appendChild(inpTo);
      var btnRange = mkDlBtn('选范围', false);
      btnRange.addEventListener('click', function (ev) {
        ev.stopPropagation();
        var a = parseInt(inpFrom.value, 10) || 1;
        var b = parseInt(inpTo.value, 10) || 1;
        if (a > b) { var t = a; a = b; b = t; }
        selectRange(a, b);
      });
      tb.appendChild(btnRange);

      var btnStart = mkDlBtn('开始下载 (0)', true);
      btnStart.id = 'dlSelStart';
      btnStart.addEventListener('click', function (ev) { ev.stopPropagation(); startSelectedDownload(); });
      tb.appendChild(btnStart);

      var btnCancel = mkDlBtn('取消', false);
      btnCancel.addEventListener('click', function (ev) { ev.stopPropagation(); exitSelectMode(); });
      tb.appendChild(btnCancel);

      if (_.parentNode) _.parentNode.insertBefore(tb, _);
      selectToolbar = tb;
    }

    function enterSelectMode() {
      selectMode = true;
      selectedUrls = {};
      btnDownloadAll.textContent = '选择章节...';
      btnDownloadAll.disabled = true;
      buildSelectToolbar();
      renderCatalog();
    }

    function exitSelectMode() {
      selectMode = false;
      selectedUrls = {};
      removeSelectToolbar();
      btnDownloadAll.textContent = STR.download;
      btnDownloadAll.disabled = false;
      renderCatalog();
    }

    function startSelectedDownload() {
      var checks = allChecks();
      var map = catalogMap();
      var list = [];
      checks.forEach(function (cb) {
        if (cb.checked) list.push({ url: cb.dataset.dlUrl, title: map[cb.dataset.dlUrl] || '' });
      });
      if (!list.length) { toast('请先勾选要下载的章节'); return; }
      selectMode = false;
      removeSelectToolbar();
      dlRunning = true;
      btnDownloadAll.textContent = '下载中 0/' + list.length;
      btnDownloadAll.disabled = false;
      renderCatalog();
      send({ type: 'downloadAll', chapters: list });
    }

    btnDownloadAll.addEventListener('click', function (ev) {
      ev.stopPropagation();
      if (dlRunning) {
        if (btnDownloadAll.textContent.indexOf('停止中') !== -1) return;
        btnDownloadAll.textContent = '停止中...';
        btnDownloadAll.disabled = true;
        toast('正在停止下载...');
        send({ type: 'downloadPause' });
        return;
      }
      if (selectMode) return;
      var list = (tocData && tocData.length >= 20) ? tocData : C.slice();
      if (!list || list.length === 0) {
        toast('暂无章节可下载');
        return;
      }
      enterSelectMode();
    });

    function syncNightBtn() {
      if (s.theme === 'dark') {
        btnNight.querySelector('span').textContent = STR.day;
        btnNight.classList.add('active');
      } else {
        btnNight.querySelector('span').textContent = STR.night;
        btnNight.classList.remove('active');
      }
    }
    btnNight.addEventListener('click', function (ev) {
      ev.stopPropagation();
      if (s.theme === 'dark') {
        s.theme = s.prevTheme || 'warm';
      } else {
        s.prevTheme = s.theme;
        s.theme = 'dark';
      }
      document.body.className = 'theme-' + s.theme;
      syncNightBtn();
      syncThemeDots();
      saveSettings();
    });

    function openSettings() {
      G = true;
      Y.classList.add('visible');
      j.classList.add('visible');
      hideBars();
    }
    function closeSettings() {
      G = false;
      Y.classList.remove('visible');
      j.classList.remove('visible');
    }
    document.getElementById('btnSettings').addEventListener('click', function (ev) { ev.stopPropagation(); openSettings(); });
    j.addEventListener('click', function () { closeSettings(); });
    document.getElementById('btnManagePurify').addEventListener('click', function (ev) {
      ev.stopPropagation();
      closeSettings();
      openExtraPanel('purifyPanel');
    });
    document.getElementById('purifyClose').addEventListener('click', function (ev) { ev.stopPropagation(); closeExtraPanel(); });
    document.getElementById('purifyAddBtn').addEventListener('click', function (ev) {
      ev.stopPropagation();
      var inp = document.getElementById('purifyInput');
      var v = (inp.value || '').trim();
      if (!v) return;
      send({ type: 'addPurifyWords', words: v });
      inp.value = '';
    });
    document.getElementById('purifyInput').addEventListener('keydown', function (ev) {
      if (ev.key === 'Enter') {
        ev.stopPropagation();
        var v = (this.value || '').trim();
        if (!v) return;
        send({ type: 'addPurifyWords', words: v });
        this.value = '';
      }
    });
    /* 净化说明：默认收起，点标题展开/收起，标题栏带箭头标识 */
    (function () {
      var help = document.getElementById('purifyHelp');
      if (!help) return;
      var raw = help.innerHTML;
      // 去掉原标题 <b>…</b><br>，只保留正文说明
      raw = raw.replace(/^\s*<b>[\s\S]*?<\/b>\s*<br\s*\/?\s*>/i, '');
      var arrow = document.createElement('span');
      arrow.id = 'purifyHelpArrow';
      arrow.textContent = '▾';
      arrow.style.cssText = 'flex:none;font-size:12px;line-height:1;display:inline-block;color:inherit;opacity:.7;transition:transform .25s;transform:rotate(-90deg);';
      var head = document.createElement('div');
      head.id = 'purifyHelpHead';
      head.style.cssText = 'display:flex;align-items:center;justify-content:space-between;gap:8px;cursor:pointer;user-select:none;-webkit-user-select:none;';
      var title = document.createElement('b');
      title.textContent = '净化说明（阅读和下载TXT都会生效）';
      head.appendChild(title);
      head.appendChild(arrow);
      var body = document.createElement('div');
      body.id = 'purifyHelpBody';
      body.style.cssText = 'margin-top:8px;display:none;';
      body.innerHTML = raw;
      help.innerHTML = '';
      help.appendChild(head);
      help.appendChild(body);
      head.addEventListener('click', function (ev) {
        ev.stopPropagation();
        var collapsed = body.style.display === 'none';
        body.style.display = collapsed ? 'block' : 'none';
        arrow.style.transform = collapsed ? 'rotate(0deg)' : 'rotate(-90deg)';
      });
    })();

    function applyFont() {
      b.textContent = s.fontSize;
      var cs = f.querySelectorAll('.chapter-content');
      for (var i = 0; i < cs.length; i++) cs[i].style.fontSize = s.fontSize + 'px';
      var ts = f.querySelectorAll('.chapter-title');
      for (var k = 0; k < ts.length; k++) ts[k].style.fontSize = (s.fontSize + 4) + 'px';
    }
    function syncThemeDots() {
      var dots = document.querySelectorAll('.theme-dot');
      for (var i = 0; i < dots.length; i++) dots[i].classList.toggle('active', dots[i].dataset.theme === s.theme);
    }
    function applySettings() {
      document.body.className = 'theme-' + s.theme;
      applyFont();
      var btns = document.querySelectorAll('#spacingBtns button');
      for (var i = 0; i < btns.length; i++) btns[i].classList.toggle('active', parseFloat(btns[i].dataset.val) === s.lineHeight);
      syncThemeDots();
      syncNightBtn();
      var cs = f.querySelectorAll('.chapter-content');
      for (var k = 0; k < cs.length; k++) cs[k].style.lineHeight = s.lineHeight;
    }
    function saveSettings() { send({ type: 'saveSettings', settings: s }); }

    document.getElementById('fontDec').addEventListener('click', function (ev) {
      ev.stopPropagation();
      s.fontSize = Math.max(12, s.fontSize - 2);
      applyFont(); saveSettings();
    });
    document.getElementById('fontInc').addEventListener('click', function (ev) {
      ev.stopPropagation();
      s.fontSize = Math.min(32, s.fontSize + 2);
      applyFont(); saveSettings();
    });
    document.getElementById('spacingBtns').addEventListener('click', function (ev) {
      var tgt = ev.target;
      if (!tgt.dataset || !tgt.dataset.val) return;
      ev.stopPropagation();
      var btns = this.querySelectorAll('button');
      for (var i = 0; i < btns.length; i++) btns[i].classList.remove('active');
      tgt.classList.add('active');
      s.lineHeight = parseFloat(tgt.dataset.val);
      var cs = f.querySelectorAll('.chapter-content');
      for (var k = 0; k < cs.length; k++) cs[k].style.lineHeight = s.lineHeight;
      saveSettings();
    });
    document.getElementById('themeDots').addEventListener('click', function (ev) {
      var tgt = ev.target;
      if (!tgt.dataset || !tgt.dataset.theme) return;
      ev.stopPropagation();
      s.theme = tgt.dataset.theme;
      document.body.className = 'theme-' + s.theme;
      syncThemeDots();
      if (s.theme !== 'dark') s.prevTheme = s.theme;
      syncNightBtn();
      saveSettings();
    });

    function closeExtraPanel() {
      extraVisible = false;
      whitelistPanel.classList.remove('visible');
      historyPanel.classList.remove('visible');
      var pp = document.getElementById('purifyPanel');
      if (pp) pp.classList.remove('visible');
      extraMask.style.display = 'none';
    }

    function openExtraPanel(panelId) {
      closeExtraPanel();
      extraVisible = true;
      var panel = document.getElementById(panelId);
      if (!panel) return;
      panel.classList.add('visible');
      extraMask.style.display = 'block';
      if (panelId === 'whitelistPanel') {
        send({ type: 'getWhitelist' });
      } else if (panelId === 'historyPanel') {
        send({ type: 'getHistory' });
      } else if (panelId === 'purifyPanel') {
        send({ type: 'getPurify' });
      }
      setTimeout(function () {
        var list = panel.querySelector('.panel-list');
        if (list) setupFade(list);
      }, 50);
    }

    function bindExtraToggle(btnId, panelId) {
      document.getElementById(btnId).addEventListener('click', function (ev) {
        ev.stopPropagation();
        var panel = document.getElementById(panelId);
        if (extraVisible && panel.classList.contains('visible')) {
          closeExtraPanel();
          return;
        }
        openExtraPanel(panelId);
      });
    }

    document.getElementById('whitelistClose').addEventListener('click', function (ev) { ev.stopPropagation(); closeExtraPanel(); });
    document.getElementById('historyClose').addEventListener('click', function (ev) { ev.stopPropagation(); closeExtraPanel(); });
    extraMask.addEventListener('click', function () { closeExtraPanel(); });
    bindExtraToggle('btnWhitelist', 'whitelistPanel');
    bindExtraToggle('btnHistory', 'historyPanel');

    function setupFade(list) {
      var wrap = list.parentNode;
      if (!wrap) return;
      var topMask = wrap.querySelector('.fade-mask.top');
      var bottomMask = wrap.querySelector('.fade-mask.bottom');
      if (!topMask || !bottomMask) return;

      function checkFade() {
        var scrollTop = list.scrollTop;
        var maxScroll = list.scrollHeight - list.clientHeight;
        topMask.classList.toggle('hidden', scrollTop <= 2);
        bottomMask.classList.toggle('hidden', maxScroll - scrollTop <= 2);
      }

      list.addEventListener('scroll', checkFade);
      setTimeout(checkFade, 100);
      var observer = new MutationObserver(function () { checkFade(); });
      observer.observe(list, { childList: true, subtree: false });
      list._fadeObserver = observer;
      list._fadeCleanup = function () {
        observer.disconnect();
        list.removeEventListener('scroll', checkFade);
      };
    }

    function buildPanelItem(titleText, highlighted, onMainClick, onDelClick) {
      var item = document.createElement('div');
      item.className = 'panel-item';
      if (highlighted) {
        item.style.backgroundColor = getHighlightColor();
        item.classList.add('panel-item-hi');
      }

      var main = document.createElement('div');
      main.className = 'item-main';
      var titleSpan = document.createElement('span');
      titleSpan.className = 'item-title';
      titleSpan.textContent = titleText;
      main.appendChild(titleSpan);

      var delBtn = document.createElement('button');
      delBtn.className = 'item-del';
      delBtn.textContent = '✕';
      delBtn.setAttribute('aria-label', '删除');
      delBtn.addEventListener('click', function (ev) {
        ev.stopPropagation();
        onDelClick();
      });

      main.addEventListener('click', onMainClick);
      item.appendChild(main);
      item.appendChild(delBtn);
      return item;
    }

    function renderPanelList(containerId, emptyHtml, items) {
      var container = document.getElementById(containerId);
      if (container._fadeCleanup) { container._fadeCleanup(); container._fadeCleanup = null; }
      container.innerHTML = '';
      if (!items || items.length === 0) {
        container.innerHTML = '<div class="panel-empty">' + emptyHtml + '</div>';
        return;
      }
      items.forEach(function (item) { container.appendChild(item); });
      setupFade(container);
    }

    function renderWhitelist(list) {
      var items = (list || []).map(function (entry) {
        var domain = entry.domain || '';
        return buildPanelItem(entry.title || domain, domain === currentHost,
          function () { send({ type: 'navigateTo', url: 'https://' + domain }); },
          function () { send({ type: 'removeWhitelist', domain: domain }); });
      });
      renderPanelList('whitelistList', '暂无白名单', items);
      // 当前网站高亮项可能被挤到列表底部不可见：打开面板后自动滚动到可视区域（居中）
      setTimeout(function () {
        var hi = document.getElementById('whitelistList').querySelector('.panel-item-hi');
        if (hi) {
          try { hi.scrollIntoView({ block: 'center' }); } catch (e) { hi.scrollIntoView(); }
        }
      }, 100);
    }

    function renderHistory(list) {
      var sorted = (list || []).slice().sort(function (a, b) { return b.timestamp - a.timestamp; });
      var items = sorted.map(function (entry) {
        var entryKey = entry.bookKey || getBookRootKey(entry.url);
        return buildPanelItem(entry.title || '未命名', entryKey === currentBookKey,
          function () { send({ type: 'navigateTo', url: entry.url }); },
          function () { send({ type: 'removeHistory', url: entry.url }); });
      });
      renderPanelList('historyList', '暂无历史记录', items);
    }

    function renderPurify(list) {
      var items = (list || []).map(function (w) {
        return buildPanelItem(w, false,
          function () {},
          function () { send({ type: 'removePurifyWord', word: w }); });
      });
      renderPanelList('purifyList', '暂无净化词', items);
      var pspan = document.getElementById('purifyPanel').querySelector('.panel-header span');
      if (pspan) pspan.textContent = '净化词（' + (list || []).length + '）· 点✕删除';
    }

    send({ type: 'ready' });
  }

  var READER_JS = "(function () {\n'use strict';\n" + SHARED_SRC + "\n" + iframeMain.toString() + "\niframeMain();\n})();";

  var READER_HTML = '<!DOCTYPE html><html lang="zh-CN"><head><meta charset="utf-8">' +
    '<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">' +
    '<title>阅读模式</title><style>' + READER_CSS + '</style></head>' +
    '<body class="theme-warm">' + READER_BODY +
    '<script>' + READER_JS + '</scr' + 'ipt></body></html>';

  function buildIframe(chapter) {
    var root = document.createElement('div');
    root.id = '__novel_reader_root__';
    root.style.cssText = 'position:fixed;top:0;left:0;right:0;bottom:0;z-index:2147483647;background:#f7f0e3;';
    var ifr = document.createElement('iframe');
    ifr.style.cssText = 'display:block;width:100%;height:100%;border:none;';
    root.appendChild(ifr);
    (document.body || document.documentElement).appendChild(root);
    state.root = root;
    state.win = ifr.contentWindow;
    state.pendingInit = chapter;
    window.addEventListener('message', onMessage);
    ifr.srcdoc = READER_HTML;
  }

  function post(m) { try { if (state.win) state.win.postMessage(m, '*'); } catch (e) {} }

  /* ==================== 下载功能 ==================== */
  var dlState = null;
  function downloadAll(chapters) {
    if (!chapters || chapters.length === 0) {
      toast('没有可下载的章节');
      post({ type: 'downloadComplete' });
      return;
    }
    __diag.info('开始下载，共 ' + chapters.length + ' 章');
    var total = chapters.length;
    var results = new Array(total);
    var done = 0;
    var stopped = false;
    var active = 0;
    var concurrency = 5;
    var queue = chapters.map(function (c, i) { return { chap: c, idx: i }; });
    var handles = [];
    var retryRound = 0;
    var MAX_RETRY_ROUNDS = 2;

    function abortActive() {
      handles.forEach(function (h) { try { h.abort(); } catch (e) {} });
      handles = [];
    }

function finalize(paused) {
  dlState = null;
  abortActive();
  var parts = [];
  var got = 0;
  for (var i = 0; i < total; i++) {
    var r = results[i];
    // 停止时未下载的章节（"已跳过"占位）不写入下载文件，直接剔除
    if (!r || r.text.indexOf('【已跳过') === 0) continue;
    got++;
    parts.push(r.title + '\n\n' + r.text + '\n\n');
  }
  if (got === 0) {
    __diag.warn('下载结束: 未下载到任何章节 (共' + total + ')');
    post({ type: 'downloadComplete' });
    toast('没有下载到任何章节');
    return;
  }
  var failedTitles = [];
  for (var f = 0; f < total; f++) {
    var rf = results[f];
    if (!rf || rf.text.replace(/\s+/g, '').length < 10 || rf.text.indexOf('【已跳过') === 0) {
      failedTitles.push((chapters[f] && chapters[f].title) || ('#' + (f + 1)));
    }
  }
  if (failedTitles.length) {
    __diag.warn('下载失败/跳过章节 (' + failedTitles.length + '/' + total + '): ' + failedTitles.slice(0, 8).join(' | ') + (failedTitles.length > 8 ? ' ...' : ''));
  }
  __diag.info('下载结束: 成功 ' + got + '/' + total + (paused ? ' (用户已停止)' : ''));
  var text = '来源：' + location.href + '\n\n\n' + parts.join('');
  saveTextFile(text);
  if (paused) {
    post({ type: 'downloadPaused', current: got, total: total });
  } else {
    post({ type: 'downloadComplete' });
  }
}

    function stopDownload() {
      if (stopped) return;
      stopped = true;
      __diag.warn('收到停止下载请求');
      post({ type: 'downloadStopping' });
    }
    dlState = { stop: stopDownload };

    function fetchOne(item, cb) {
      var url = item.chap.url;
      var title = item.chap.title;
      var maxRetries = 3;
      var retryDelays = [2000, 5000, 10000];
      var pageErrors = [];
      __diag.info('下载章节: [' + (item.idx + 1) + '/' + total + '] ' + title);

      function attemptFetch(retryCount) {
        // 优雅停止：仅在章节还没开始抓取时跳过；已在途的章节让它完整下载完（含全部分页）
        if (stopped && retryCount === 0) {
          __diag.warn('章节已跳过(用户停止下载): [' + (item.idx + 1) + '/' + total + '] ' + title);
          results[item.idx] = { title: title, text: '【已跳过（等待重试）】' };
          cb();
          return;
        }

        var visited = {};
        var maxPages = 50;
        var baseTitle = null;
        var allText = '';
        var pageRetryCount = 0;
        var incomplete = false;   // 分页缺失标记：某页重试后仍失败，内容不完整

        function fetchWithRetry(u, cbPage) {
          var retry = 0;
          var maxPageRetry = 3;
          var pageRetryDelays = [1500, 3000, 6000];
          function doFetch() {
            var h = fetchUrl(u, function (err, html) {
              if (err || !html) {
                pageErrors.push((err || '空响应') + ' ' + u);
                if (retry < maxPageRetry) {
                  retry++;
                  setTimeout(doFetch, pageRetryDelays[retry - 1] || 3000);
                } else {
                  cbPage(null);
                }
                return;
              }
              cbPage(html);
            });
            if (h) handles.push(h);
          }
          doFetch();
        }

        function fetchPageRecursive(u, pageNum, callback) {
          if (visited[u] || pageNum > maxPages) {
            callback(null);
            return;
          }
          visited[u] = true;
          fetchWithRetry(u, function (html) {
            if (!html) {
              // 分页请求重试后仍失败：在该位置备注缺失的分页（缺哪页就在哪备注）
              if (pageNum > 1 && allText.replace(/\s+/g, '').length >= 10) {
                allText += '\n\n【下载提示】第' + pageNum + '页下载失败（' + u + '），本章内容不完整，缺失该页及之后内容';
                incomplete = true;
                __diag.warn('分页缺失: [' + (item.idx + 1) + '/' + total + '] ' + title + ' 第' + pageNum + '页 ' + u);
              }
              callback(null);
              return;
            }
            try {
              var doc = parseHtml(html, u);
              var ch = extractFromDoc(doc, u);
              var text = ch.data ? htmlToText(ch.data) : '';
              text = cleanDownloadText(text);
              text = stripLeadingChapterHeading(text);
              // 下载与阅读共用净化词：下载的 TXT 同样清除包含净化词的句子
              text = purifyLines(text, getPurifyWords());
              if (text.replace(/\s+/g, '').length < 10) text = '【内容为空】';
              var pageTitle = ch.title || title;

              if (pageNum === 1) {
                baseTitle = pageTitle;
                allText = text;
              } else {
                var same = false;
                try {
                  var num1 = parseChapterNumber(baseTitle);
                  var num2 = parseChapterNumber(pageTitle);
                  if (num1 !== null && num2 !== null && num1 === num2) same = true;
                } catch(e) {}
                if (!same && baseTitle !== pageTitle) {
                  callback(null);
                  return;
                }
                allText += '\n\n' + text;
              }

              var nextUrl = ch.next_url || '';
              if (nextUrl && !visited[nextUrl]) {
                fetchPageRecursive(nextUrl, pageNum + 1, function() {
                  callback(null);
                });
              } else {
                callback(null);
              }
            } catch(e) {
              callback(null);
            }
          });
        }

        fetchPageRecursive(url, 1, function() {
          var content = allText.trim();
          if (content.length < 50 && retryCount < maxRetries) {
            __diag.warn('章节内容过短，进入第' + (retryCount + 1) + '次重试: [' + (item.idx + 1) + '/' + total + '] ' + title + ' 长度=' + content.length + (pageErrors.length ? ' 分页错误=' + pageErrors.join(' | ') : ''));
            var delay = retryDelays[retryCount] || 5000;
            toast('第' + (retryCount+1) + '次重试：' + title);
            setTimeout(function() {
              attemptFetch(retryCount + 1);
            }, delay);
          } else {
            results[item.idx] = { title: title, text: content || '【内容为空】', incomplete: incomplete };
            var okLen = (content || '').replace(/\s+/g, '').length;
            if (okLen < 10) {
              __diag.warn('章节下载失败: [' + (item.idx + 1) + '/' + total + '] ' + title + ' 原因=内容为空或过短 长度=' + content.length + (pageErrors.length ? ' 分页错误=' + pageErrors.join(' | ') : ''));
            } else {
              __diag.info('章节下载成功: [' + (item.idx + 1) + '/' + total + '] ' + title + ' 长度=' + content.length + (pageErrors.length ? ' (分页有重试错误=' + pageErrors.join(' | ') + ')' : ''));
            }
            cb();
          }
        });
      }

      var firstDelay = Math.floor(Math.random() * 1000) + 500;
      setTimeout(function() {
        attemptFetch(0);
      }, firstDelay);
    }

function next() {
  if (!stopped && queue.length > 0) {
    while (active < concurrency && queue.length > 0) {
      var item = queue.shift();
      active++;
      fetchOne(item, function () {
        active--;
        if (!stopped) {
          done++;
          post({ type: 'downloadProgress', current: done, total: total });
        }
        next();
      });
    }
    return;
  }

  if (active > 0) return;

  var emptyIndices = [];
  for (var i = 0; i < total; i++) {
    var rr = results[i];
    // 空章节 + 分页缺失（内容不完整）的章节都进入最终重试，给分页恢复的机会
    if (!rr || rr.text.replace(/\s/g, '').length < 10 || rr.incomplete) {
      emptyIndices.push(i);
    }
  }

  // 用户已停止下载时不再重试空/不完整章节，直接收尾
  if (emptyIndices.length > 0 && retryRound < MAX_RETRY_ROUNDS && !stopped) {
    retryRound++;
    toast('检测到 ' + emptyIndices.length + ' 个空/不完整章节，开始第 ' + retryRound + ' 轮最终重试...');
    for (var k = 0; k < emptyIndices.length; k++) {
      var idx = emptyIndices[k];
      results[idx] = null;
      queue.push({ chap: chapters[idx], idx: idx });
    }
    next();
    return;
  }

  finalize(stopped);
}

    next();
  }

  /* ==================== 消息处理（主线程） ==================== */
  function onMessage(ev) {
    var m = ev.data;
    if (!m || typeof m !== 'object' || !m.type) return;
    switch (m.type) {
      case '__diag':
        try { if (m.msg) __diag.push(m.level || 'LOG', m.msg); } catch (e) {}
        break;
      case 'ready': {
        var ch = state.pendingInit;
        if (!ch) return;
        post({
          type: 'init',
          chapter: { url: ch.url, title: ch.title, data: ch.data, next_url: ch.next_url, prev_url: ch.prev_url },
          settings: getSettings() || { fontSize: 18, lineHeight: 1.9, theme: 'warm' },
          toc: ch.toc || [],
          tocUrl: ch.tocUrl || '',
          bookKey: state.bookKey,
          bookTitle: state.bookTitle,
          host: window.location.hostname,
          isComic: !!ch.isComic,
          images: ch.images || [],
          purify: getPurifyWords()
        });
        // 目录提前加载改由 iframe 收到 init 后自动发起（见 iframe 内 init 分支），
        // 此处不再向 iframe 重复投递 fetchToc，避免与 iframe 自触发并列运行造成重复抓取
        break;
      }
      case 'fetchChapter': handleFetchChapter(m); break;
      case 'fetchToc': handleFetchToc(m); break;
      case 'stopFetchToc':
        _tocStop = true;
        break;
      case 'saveSettings':
        try { GM_setValue(KEY_SETTINGS, JSON.stringify(m.settings || {})); } catch (e) {}
        break;
      case 'setCurrentUrl':
        if (m.url && m.title) {
          addHistory(m.title, m.url, m.bookKey || state.bookKey, m.bookTitle || state.bookTitle);
        }
        break;
      case 'exit': closeReader(); break;
      case 'downloadAll': {
        downloadAll(m.chapters);
        break;
      }
      case 'downloadPause': {
        if (dlState) { try { dlState.stop(); } catch (e) {} }
        break;
      }
      case 'getPurify': {
        post({ type: 'purifyData', list: getPurifyWords() });
        break;
      }
      case 'removePurifyWord': {
        if (m.word) {
          var pl = getPurifyWords().filter(function (w) { return w !== m.word; });
          if (pl.length !== getPurifyWords().length) {
            savePurifyWords(pl);
            toast('已移除净化词：' + m.word);
          }
          post({ type: 'purifyData', list: pl });
          notifyPurifyUpdate();
        }
        break;
      }
      case 'addPurifyWords': {
        if (m.words) {
          var addedN = addPurifyWordsBulk(m.words);
          if (addedN > 0) {
            toast('已添加 ' + addedN + ' 个净化词');
            notifyPurifyUpdate();
          }
          post({ type: 'purifyData', list: getPurifyWords() });
        }
        break;
      }
      case 'getWhitelist': {
        var wl = getWhitelist();
        post({ type: 'whitelistData', list: wl });
        break;
      }
      case 'getHistory': {
        var hist = getHistory();
        post({ type: 'historyData', list: hist });
        break;
      }
      case 'removeWhitelist': {
        if (m.domain) {
          var list = getWhitelist().filter(function(d) { return d.domain !== m.domain; });
          saveWhitelist(list);
          toast('已删除：' + m.domain);
          post({ type: 'whitelistData', list: list });
        }
        break;
      }
      case 'removeHistory': {
        if (m.url) {
          var oldHist = getHistory();
          var removedKey = '';
          for (var hi = 0; hi < oldHist.length; hi++) {
            if (oldHist[hi].url === m.url) { removedKey = oldHist[hi].bookKey || getBookRootKey(oldHist[hi].url); break; }
          }
          var hist = oldHist.filter(function(item) { return item.url !== m.url; });
          saveHistory(hist);
          if (removedKey) removeTocCacheForBook(removedKey);
          toast('已删除历史记录');
          post({ type: 'historyData', list: hist });
        }
        break;
      }
      case 'navigateTo': {
        if (m.url) {
          try { window.top.location.href = m.url; } catch(e) {}
        }
        break;
      }
    }
  }

  /* ==================== 获取章节 ==================== */
  function handleFetchChapter(m) {
    var url = m.url || '';
    var mode = m.mode || 'stitch';
    if (!url) { post({ type: 'chapterFailed', url: url, mode: mode, reason: 'noUrl' }); return; }
    if (mode === 'jump') {
      state.visited = {};
      state.stitchCount = 0;
      state.visited[noHash(url)] = 1;
    } else {
      if (state.visited[noHash(url)] || state.stitchCount >= MAX_STITCH) {
        __diag.warn('章节重复或超限，已拦截: ' + url + ' (mode=' + mode + ')');
        post({ type: 'chapterFailed', url: url, mode: mode, reason: 'dupOrLimit' });
        return;
      }
      state.visited[noHash(url)] = 1;
      state.stitchCount++;
    }
    doFetchChapter(url, mode, 1);
  }

  // 抓取并解析章节；jump（目录切章）模式下网络/超时失败自动重试一次，吸收瞬时网络抖动与站点限流
  function doFetchChapter(url, mode, retriesLeft) {
    function fail(reason) {
      // 自动加载失败：释放该 URL 的占用标记，允许 iframe 端稍后重试，
      // 否则重试请求会被 visited 判为重复，报 dupOrLimit 且自动加载彻底失效
      if (mode === 'stitch') { try { delete state.visited[noHash(url)]; } catch (e2) {} }
      __diag.warn('章节抓取失败: ' + url + ' 原因=' + reason + ' mode=' + mode);
      post({ type: 'chapterFailed', url: url, mode: mode, reason: reason });
    }
    fetchUrl(url, function (err, html) {
      if (err || !html) {
        if (mode === 'jump' && retriesLeft > 0) {
          setTimeout(function () { doFetchChapter(url, mode, retriesLeft - 1); }, 600);
          return;
        }
        fail('fetch:' + (err || 'empty'));
        return;
      }
      var doc = null;
      var ch = null;
      try {
        doc = parseHtml(html, url);
        ch = extractFromDoc(doc, url);
      } catch (e) {
        try { console.warn('[阅读模式] 章节解析异常(带堆栈):', url, e && e.message, (e && e.stack) || ''); } catch (e3) {}
      }
      // 主解析失败、抛异常或内容过短 → 纯字符串兜底（不依赖 DOM，避开 Illegal invocation 类错误）
      var ok = !!(ch && ch.data && ch.textContent.replace(/\s+/g, '').length >= 30);
      if (!ok) {
        try {
          var fb = fallbackExtractHtml(html, url);
          if (fb && fb.data && fb.textContent.replace(/\s+/g, '').length >= 30) {
            ch = fb; ok = true;
          }
        } catch (e5) {}
      }
      if (!ok) {
        fail('emptyOrShort');
        return;
      }
      try {
        // 阅读正文与下载同规则清洗：去分页页码/未完下一页提示、去开头章节标题、净化词过滤
        var cleanData = ch.data;
        try {
          cleanData = cleanReaderHtml(ch.data, getPurifyWords(), { stripLeadingHeading: true });
        } catch (eC) { try { console.warn('[阅读模式] 正文清洗异常:', url, eC && eC.message); } catch (e3) {} }
        __diag.info('章节抓取成功: ' + url + ' 标题=' + (ch.title || '') + ' 长度=' + ch.textContent.length);
        post({
          type: 'chapterReady', url: url, mode: mode,
          chapter: { url: ch.url, title: ch.title, data: cleanData, next_url: ch.next_url, prev_url: ch.prev_url, images: ch.images || [] }
        });
      } catch (e) { fail('err:' + (e && e.message)); }
    });
  }

  function sortPageUrls(urls) {
    function getPageNum(url) {
      var m = url.match(/[?&]page=(\d+)/i) ||
              url.match(/[?&]p=(\d+)/i) ||
              url.match(/\/page\/(\d+)/i) ||
              url.match(/\/p(\d+)/i) ||
              url.match(/_(\d+)\.html/) ||
              url.match(/-p(\d+)/i) ||
              url.match(/\/(\d+)\.html/) ||
              url.match(/\/(\d+)\/?$/);
      return m ? parseInt(m[1], 10) : 1;
    }
    var nums = urls.map(getPageNum);
    if (!nums.some(function(n) { return n > 1; })) return urls;
    return urls.slice().sort(function(a, b) {
      return getPageNum(a) - getPageNum(b);
    });
  }

  function extractTocPage(doc, baseUrl) {
    var host = '';
    try { host = new URL(baseUrl).host; } catch (e) {}
    var anchors = [];
    try { anchors = Array.prototype.slice.call(doc.querySelectorAll('a[href]')); } catch (e) {}
    var strict = [], loose = [], seenS = {}, seenL = {};
    anchors.forEach(function (a) {
      var href = a.getAttribute('href');
      if (isBadHref(href)) return;
      var u = resolveUrl(href, baseUrl);
      if (!u) return;
      try { if (new URL(u).host !== host) return; } catch (e) { return; }
      if (noHash(u) === noHash(baseUrl)) return;
      var t = (a.textContent || '').trim().replace(/\s+/g, ' ');
      if (t.length < 2 || t.length > 50) return;
      if (NAV_WORDS.test(t)) return;
      if (/第\s*\(\d+\/\d+\)\s*页/.test(t)) return;
      if (CHAP_RE.test(t) && !seenS[u]) { seenS[u] = 1; strict.push({ title: t, url: u }); }
      if (!seenL[u]) { seenL[u] = 1; loose.push({ title: t, url: u }); }
    });
    var list = strict.length >= 5 ? strict : loose;
    if (list.length > 50000) list = list.slice(0, 50000);

    var optionUrls = [];
    var options = doc.querySelectorAll('option[value]');
    options.forEach(function(opt) {
      var val = opt.getAttribute('value');
      if (val) {
        var u = resolveUrl(val, baseUrl);
        if (u && !isBadHref(u) && noHash(u) !== noHash(baseUrl)) {
          if (optionUrls.indexOf(u) === -1) {
            optionUrls.push(u);
          }
        }
      }
    });
    return { chapters: list, optionUrls: optionUrls };
  }

  function handleFetchToc(m) {
    var url = m.url || '';
    if (!url) return;
    if (_tocBusy) {
      __diag.warn('目录抓取已在进行中，忽略重复触发: ' + url);
      return;
    }
    _tocBusy = true;
    __diag.info('开始抓取目录: ' + url);
    _tocStop = false;
    var visited = {};
    var queued = {};
    var queue = [url];
    queued[url] = 1;
    var pageChapters = {};
    var pageOrder = [];
    var MAX_PAGES = 500;
    var MAX_CHAPTERS = 20000;
    var CONCURRENCY = 5;

    function countChapters() {
      var n = 0;
      for (var k in pageChapters) n += pageChapters[k].length;
      return n;
    }

    function sendProgress() {
      if (state.win) {
        state.win.postMessage({ type: 'tocProgress', count: countChapters() }, '*');
      }
    }

    function enqueue(u) {
      if (u && !visited[u] && !queued[u]) {
        queued[u] = 1;
        queue.push(u);
      }
    }

    function fetchPage(pageUrl) {
      return new Promise(function (resolve) {
        if (_tocStop || visited[pageUrl]) { resolve(); return; }
        visited[pageUrl] = 1;
        fetchUrl(pageUrl, function (err, html) {
          if (_tocStop || err || !html) {
            if (!_tocStop && (err || !html)) __diag.warn('目录分页抓取失败: ' + pageUrl + ' 原因=' + (err || '空响应'));
            resolve(); return;
          }
          try {
            var doc = parseHtml(html, pageUrl);
            var result = extractTocPage(doc, pageUrl);

            var fullTocUrl = null, nextPageUrl = null;
            var anchors = doc.querySelectorAll('a[href]');
            anchors.forEach(function (a) {
              var text = a.textContent.trim();
              var href = a.getAttribute('href');
              if (isBadHref(href)) return;
              var u = resolveUrl(href, pageUrl);
              if (!u || u === pageUrl || visited[u]) return;
              if (/(查看完整目录|完整目录|全部章节|所有章节|显示全部目录|查看更多章节|更多章节)/i.test(text)) {
                fullTocUrl = u;
              }
              if (!queued[u] && (/^(下一页|下页|next|›|»|→|>>)$/i.test(text) || /下一页/.test(text))) {
                nextPageUrl = u;
              }
            });

            var hasPagination = (result.optionUrls && result.optionUrls.length > 0) || !!nextPageUrl;
            if (!hasPagination && fullTocUrl) {
              queue = [fullTocUrl];
              queued = {};
              queued[fullTocUrl] = 1;
              pageChapters[pageUrl] = [];
              resolve();
              return;
            }

            if (result.chapters && result.chapters.length) {
              pageChapters[pageUrl] = result.chapters;
              pageOrder.push(pageUrl);
            }
            if (result.optionUrls) {
              sortPageUrls(result.optionUrls).forEach(enqueue);
            }
            enqueue(nextPageUrl);
            enqueue(fullTocUrl);
            sendProgress();
          } catch (e) {}
          resolve();
        });
      });
    }

    function processQueue() {
      var active = 0;
      var inFlight = [];
      var finished = false;

      function next() {
        if (_tocStop || queue.length === 0 || countChapters() >= MAX_CHAPTERS || Object.keys(visited).length >= MAX_PAGES) {
          if (inFlight.length > 0) {
            // 等在途请求排空后重新检查队列，避免提前 finish 漏掉刚入队的分页目录（修复多页目录只加载第 1 页）
            Promise.all(inFlight).then(function () { setTimeout(next, 0); });
          } else {
            finish();
          }
          return;
        }
        var nextUrl = queue.shift();
        if (visited[nextUrl]) {
          setTimeout(next, 0);
          return;
        }
        var promise = fetchPage(nextUrl);
        inFlight.push(promise);
        promise.then(function () {
          active--;
          inFlight = inFlight.filter(function (p) { return p !== promise; });
          setTimeout(next, 0);
        });
        active++;
        if (active < CONCURRENCY && queue.length > 0) {
          setTimeout(next, 0);
        }
      }

      function finish() {
        if (finished) return;
        finished = true;
        _tocBusy = false;
        var sortedPages = sortPageUrls(pageOrder);
        var allChapters = [];
        var seen = {};
        for (var i = 0; i < sortedPages.length; i++) {
          var chapters = pageChapters[sortedPages[i]];
          if (!chapters) continue;
          for (var j = 0; j < chapters.length; j++) {
            if (!seen[chapters[j].url]) {
              seen[chapters[j].url] = 1;
              allChapters.push(chapters[j]);
              if (allChapters.length >= MAX_CHAPTERS) break;
            }
          }
          if (allChapters.length >= MAX_CHAPTERS) break;
        }
        __diag.info('目录抓取完成: ' + allChapters.length + ' 章 (页数=' + sortedPages.length + (_tocStop ? ', 用户已停止' : '') + ')');
        // 抓取成功（非用户停止且有章节）则写入目录缓存，供24小时内再次进入正文页直接复用
        if (!_tocStop && allChapters.length > 0 && state.bookKey) {
          try {
            saveTocCacheForBook(state.bookKey, allChapters, url, state.bookTitle || '');
            __diag.info('目录缓存已保存: ' + state.bookKey + ' 共' + allChapters.length + '章');
          } catch (eTc) { try { __diag.warn('目录缓存保存异常: ' + (eTc && eTc.message)); } catch (e2) {} }
        }
        post({ type: 'tocReady', toc: allChapters });
      }

      for (var i = 0; i < CONCURRENCY && queue.length > 0; i++) {
        setTimeout(next, 0);
      }
    }

    processQueue();
  }

  /* ==================== 开启 / 关闭（含导航拦截） ==================== */
  function beforeUnloadHandler(e) {
    if (state.open && !state.exiting) {
      e.preventDefault();
      e.returnValue = '阅读模式正在运行，确定要离开吗？';
      return e.returnValue;
    }
  }

  function bindBeforeUnload() {
    window.addEventListener('beforeunload', beforeUnloadHandler);
  }

  function unbindBeforeUnload() {
    window.removeEventListener('beforeunload', beforeUnloadHandler);
  }

  function setMainBtnsVisible(visible) {
    ['__main_whitelist_btn__', '__main_history_btn__'].forEach(function (id) {
      var el = document.getElementById(id);
      if (el) el.style.display = visible ? '' : 'none';
    });
  }

  function hideMainPanels() {
    ['__main_whitelist_panel__', '__main_history_panel__'].forEach(function (id) {
      var el = document.getElementById(id);
      if (el) el.classList.remove('visible');
    });
  }

  function setPageFixed(fixed) {
    try {
      var overflow = fixed ? 'hidden' : '';
      var position = fixed ? 'fixed' : '';
      var size = fixed ? '100%' : '';
      [document.documentElement, document.body].forEach(function (el) {
        el.style.overflow = overflow;
        el.style.position = position;
        el.style.width = size;
        el.style.height = size;
      });
    } catch (e) {}
  }

  function openReader() {
    try {
      if (state.open) { toast('阅读模式已开启'); return; }
      if (state.opening) return;
      state.opening = true;

      setMainBtnsVisible(false);
      hideMainPanels();

      var chapter = null;
      try { chapter = extractFromDoc(document, location.href); } catch (e) { __diag.error('正文提取异常: ' + (e && e.message)); chapter = null; }

      if (!chapter || !chapter.data || chapter.textContent.replace(/\s+/g, '').length < 40) {
        __diag.warn('未识别到正文，无法开启阅读模式: ' + location.href);
        toast('未识别到正文，无法开启阅读模式');
        state.opening = false;
        return;
      }

      chapter.toc = [];
      // 正文净化提前：进入阅读模式即对首章正文做净化/清洗（与后续章节抓取路径同一规则），
      // 而不是等到渲染时才净化。iframe 内渲染时仍会再净化一次（幂等，无副作用）。
      try {
        var _initClean = cleanReaderHtml(chapter.data, getPurifyWords(), { stripLeadingHeading: true });
        if (_initClean) chapter.data = _initClean;
      } catch (eC) { try { console.warn('[阅读模式] 首章正文净化异常:', eC && eC.message); } catch (e3) {} }
      // 与 1234.js 一致：立即同步打开阅读器，不再被目录信息请求阻塞。
      // 书信息（书名/bookKey）改为后台异步补充，完成后通过 setBookInfo 通知阅读器。
      var bookKey0 = getBookRootKey(location.href);
      var bookTitle0 = extractNovelTitle(document.title) || '未命名';
      state.bookKey = bookKey0;
      state.bookTitle = bookTitle0;
      addHistory(chapter.title || document.title, location.href, bookKey0, bookTitle0);
      // 命中未过期的目录缓存：直接注入，iframe 拿到非空 toc 后不会重新抓取目录页
      try {
        var cachedToc = getTocCacheForBook(bookKey0);
        if (cachedToc && cachedToc.toc && cachedToc.toc.length) {
          chapter.toc = cachedToc.toc;
          if (!chapter.tocUrl && cachedToc.tocUrl) chapter.tocUrl = cachedToc.tocUrl;
          if (cachedToc.title && cachedToc.title !== '未命名') state.bookTitle = cachedToc.title;
          // 刷新该书缓存时间戳（LRU：最近阅读的书续期24小时，最久未读的优先淘汰）
          saveTocCacheForBook(bookKey0, cachedToc.toc, chapter.tocUrl || cachedToc.tocUrl || '', state.bookTitle || cachedToc.title || '');
          __diag.info('命中目录缓存: ' + bookKey0 + ' 共' + cachedToc.toc.length + '章，跳过目录抓取');
        }
      } catch (eTc) { try { __diag.warn('目录缓存读取异常: ' + (eTc && eTc.message)); } catch (e2) {} }
      // tocUrl 在缓存补全之后再取，保证缓存里的目录页URL也能用于后续书名异步补充
      var tocUrl = chapter.tocUrl || '';
      buildIframe(chapter);
      state.open = true;
      state.opening = false;
      __diag.info('阅读模式已开启: ' + location.href + ' 书名=' + state.bookTitle);
      setPageFixed(true);
      bindBeforeUnload();   // 绑定拦截

      if (tocUrl) {
        fetchUrl(tocUrl, function (err, html) {
          var bookTitle = bookTitle0;
          if (!err && html) {
            try {
              var tdoc = parseHtml(html, tocUrl);
              bookTitle = extractNovelTitle(tdoc.title || '') || '未命名';
            } catch (e) {}
          }
          // 历史记录文字(t.书标题)与链接(最新章节 url)分离：目录页 title 写回 title 字段，
          // url 字段不动（由 addHistory 每次阅读时更新为最新章节），同书仍按 bookKey 去重只留一条。
          if (bookTitle && bookTitle !== '未命名') {
            var hist = getHistory();
            for (var hi = 0; hi < hist.length; hi++) {
              var hk = hist[hi].bookKey || getBookRootKey(hist[hi].url);
              if (hk === bookKey0) {
                hist[hi].title = bookTitle;
                hist[hi].bookKey = bookKey0;
                // 仅当 url 缺失或仍是书根时，才回填当前打开的章节链接
                if (!hist[hi].url || hist[hi].url === bookKey0) {
                  hist[hi].url = location.href.split('#')[0];
                }
                saveHistory(hist);
                break;
              }
            }
          }
          if (state.win) {
            // 固定用章节页推导的书根 key（与历史条目一致），避免与目录页 key 不一致导致同书多条
            var newBookKey = bookKey0;
            var newBookTitle = (bookTitle && bookTitle !== '未命名') ? bookTitle : state.bookTitle;
            if (newBookKey !== state.bookKey || newBookTitle !== state.bookTitle) {
              state.bookKey = newBookKey;
              state.bookTitle = newBookTitle;
              try { state.win.postMessage({ type: 'setBookInfo', bookKey: state.bookKey, bookTitle: state.bookTitle }, '*'); } catch (e2) {}
            }
          }
        });
      }
    } catch (e) {
      console.error('阅读模式增强版启动异常，已回退', e);
      toast('阅读模式启动失败（' + e.message + '），请刷新重试');
      __diag.error('开启阅读模式异常: ' + (e && e.stack ? e.stack : (e && e.message)));
      state.opening = false;
    }
  }

  function closeReader() {
    state.exiting = true;   // 设置退出标志，避免 beforeunload 拦截
    unbindBeforeUnload();
    window.removeEventListener('message', onMessage);
    if (state.root && state.root.parentNode) state.root.parentNode.removeChild(state.root);
    state.root = null;
    state.win = null;
    state.open = false;
    state.opening = false;
    state.exiting = false;

    setMainBtnsVisible(true);
    hideMainPanels();
    setPageFixed(false);
    __diag.info('阅读模式已关闭');

    try { sessionStorage.setItem('__novel_reader_exit__', location.href); } catch (e) {}
  }

  /* ==================== 白名单管理 ==================== */
  function addWhitelistDomain(domain, doneMsgFn) {
    var list = getWhitelist();
    var exists = list.some(function (item) { return item.domain === domain; });
    if (exists) { toast('已在白名单中：' + domain); return; }
    list.push({ domain: domain, title: '' });
    saveWhitelist(list);
    toast('正在获取站点标题...');
    fetchSiteTitle(domain, function (title) {
      var currentList = getWhitelist();
      for (var i = 0; i < currentList.length; i++) {
        if (currentList[i].domain === domain) {
          currentList[i].title = title || domain;
          break;
        }
      }
      saveWhitelist(currentList);
      if (state.win) {
        state.win.postMessage({ type: 'whitelistData', list: currentList }, '*');
      }
      toast(doneMsgFn(title || domain));
    });
  }

  function manageWhitelist() {
    for (;;) {
      var list = getWhitelist();
      var lines = list.length
        ? list.map(function (item, i) {
            var display = item.title ? item.title + ' (' + item.domain + ')' : item.domain;
            return (i + 1) + '. ' + display;
          }).join('\n')
        : '（空白名单）';
      var input = prompt('域名白名单（白名单内的网站打开时自动进入阅读模式）：\n' + lines +
        '\n\n· 输入序号：删除对应域名\n· 输入域名：添加（如 www.example.com）\n· 点击取消：退出', '');
      if (input === null) break;
      input = input.trim();
      if (!input) continue;
      if (/^\d+$/.test(input)) {
        var idx = parseInt(input, 10) - 1;
        if (idx >= 0 && idx < list.length) {
          var removed = list.splice(idx, 1)[0];
          saveWhitelist(list);
          toast('已移除：' + (removed.title || removed.domain));
        }
      } else {
        var d2 = input.replace(/^https?:\/\//i, '').split('/')[0].toLowerCase();
        if (d2 && d2.indexOf('.') !== -1) {
          addWhitelistDomain(d2, function (t) { return '已更新标题：' + t; });
        }
      }
    }
  }
  /* ==================== 净化词管理 ==================== */
  function notifyPurifyUpdate() {
    // 净化词变更后，通知阅读器对已加载章节即时重净
    if (state.win) {
      try { state.win.postMessage({ type: 'purifyUpdate', purify: getPurifyWords() }, '*'); } catch (e) {}
    }
  }
  // 批量添加净化词：以 、 为间隔符号，一次可加多个；返回新增数量（取消返回 null）
  function addPurifyWordsBulk(input) {
    if (input === null) return null;
    var parts = String(input).split(/、/);
    var list = getPurifyWords();
    var added = 0;
    for (var i = 0; i < parts.length; i++) {
      var w = (parts[i] || '').trim();
      if (!w) continue;
      var p = parsePurifyWord(w);
      if (!p.core) { toast('净化词无效（缺少内容）：' + w); continue; }
      if (list.indexOf(w) !== -1) { toast('净化词已存在：' + w); continue; }
      list.push(w);
      added++;
    }
    if (added > 0) savePurifyWords(list);
    return added;
  }
  function addPurifyWord() {
    var input = prompt('输入净化词（多个可用 、 间隔一次添加）\n正文中包含净化词的句子将被整体清除\n例如：无弹窗、防采集、加群请看…\n· 词前/后加 / 表示隔离，隔离侧只清词本身（如 /无弹窗/）\n点击取消：退出', '');
    if (input === null) return;
    var added = addPurifyWordsBulk(input);
    if (added > 0) {
      __diag.info('添加净化词 ' + added + ' 个（当前共' + getPurifyWords().length + '个）');
      toast('已添加 ' + added + ' 个净化词（正文已重净）');
      notifyPurifyUpdate();
    }
  }
  function managePurifyWords() {
    for (;;) {
      var list = getPurifyWords();
      var lines = list.length
        ? list.map(function (w, i) { return (i + 1) + '. ' + w; }).join('\n')
        : '（暂无净化词）';
      var input = prompt('净化词列表（正文中包含净化词的句子将被整体清除，下载同步过滤）：\n' + lines +
        '\n\n· 输入序号：删除对应净化词（多个用 、 分隔，如 2、5）\n· 输入 -词：删除该净化词（如 -无弹窗）\n· 输入词语：添加净化词（多个用 、 分隔；词前/后加 / 表示隔离）\n· 点击取消：退出', '');
      if (input === null) break;
      input = input.trim();
      if (!input) continue;
      if (/^\d+(?:[、,，]\d+)*$/.test(input)) {
        // 删除指定序号（1 基，多个）
        var idxs = input.split(/[、,，]/).map(function (s) { return parseInt(s, 10) - 1; })
          .filter(function (n) { return n >= 0 && n < list.length; })
          .sort(function (a, b) { return b - a; });
        if (!idxs.length) { toast('序号无效，未删除'); continue; }
        var removedNames = [];
        for (var r = 0; r < idxs.length; r++) removedNames.push(list.splice(idxs[r], 1)[0]);
        savePurifyWords(list);
        __diag.info('移除净化词: ' + removedNames.join('、') + '（剩余' + list.length + '个）');
        toast('已移除净化词：' + removedNames.join('、'));
        notifyPurifyUpdate();
      } else if (input.charAt(0) === '-') {
        // 删除指定词（精确匹配，多个用 、 分隔）
        var words = input.slice(1).split(/、/).map(function (s) { return s.trim(); }).filter(function (s) { return s; });
        var before = list.length;
        for (var wd = 0; wd < words.length; wd++) {
          var ix = list.indexOf(words[wd]);
          if (ix !== -1) list.splice(ix, 1);
        }
        if (list.length === before) { toast('未找到该净化词：' + words.join('、')); continue; }
        savePurifyWords(list);
        __diag.info('移除净化词: ' + words.join('、') + '（剩余' + list.length + '个）');
        toast('已移除净化词：' + words.join('、'));
        notifyPurifyUpdate();
      } else {
        var added = addPurifyWordsBulk(input);
        if (added > 0) {
          __diag.info('添加净化词 ' + added + ' 个（当前共' + getPurifyWords().length + '个）');
          toast('已添加 ' + added + ' 个净化词');
          notifyPurifyUpdate();
        }
      }
    }
  }

  /* ==================== 油猴菜单 ==================== */
  var host = '';
  try { host = location.host.toLowerCase(); } catch (e) {}

  try {
    GM_registerMenuCommand('📖 开启阅读模式', function () { openReader(); });
    if (host) {
      if (inWhitelist(host)) {
        GM_registerMenuCommand('✅ 白名单已含本域（点击移除）', function () {
          var list = getWhitelist().filter(function(item) { return item.domain !== host; });
          saveWhitelist(list);
          toast('已移出白名单：' + host);
        });
      } else {
        GM_registerMenuCommand('⭐ 将本域加入白名单', function () {
          addWhitelistDomain(host, function (t) { return '已加入白名单：' + t + '（下次自动进入阅读模式）'; });
        });
      }
    }
    GM_registerMenuCommand('📤 下载诊断日志', function () {
      var ok = __diag.download();
      if (ok) { try { toast('诊断日志已下载，请将文件发送给开发者排查'); } catch (e2) {} }
    });
  } catch (e) {}

  /* ==================== 小说页识别 ==================== */
  function looksLikeNovelPage() {
    try {
      if (CHAP_RE.test(document.title || '')) return true;
      var anchors = document.querySelectorAll('a[href]');
      var limit = Math.min(anchors.length, 300);
      for (var i = 0; i < limit; i++) {
        var t = (anchors[i].textContent || '').replace(/\s+/g, '');
        if (/^(下一[章節节回卷篇话话]|上一[章節节回卷篇话话])$/.test(t)) return true;
      }
    } catch (e) {}
    return false;
  }

  function pathDepth(p) {
    try {
      var m = (p || '/').split('?')[0].split('#')[0];
      if (m.length > 1) m = m.replace(/\/+$/, '');
      return m.split('/').filter(function (s) { return s; }).length;
    } catch (e) { return 0; }
  }

  /* ==================== 主页右下角双按钮 ==================== */
  function injectMainPanelStyles() {
    if (document.getElementById('__main_panel_styles__')) return;
    var style = document.createElement('style');
    style.id = '__main_panel_styles__';
    style.textContent = `
      #__main_whitelist_panel__, #__main_history_panel__ {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 10000;
        padding: 20px 20px 28px;
        border-radius: 16px 16px 0 0;
        transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
        transform: translateY(100%);
        max-height: 70vh;
        display: flex;
        flex-direction: column;
        background: #fff;
        box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
      }
      #__main_whitelist_panel__.visible, #__main_history_panel__.visible {
        transform: translateY(0);
      }
      #__main_whitelist_panel__ .panel-handle, #__main_history_panel__ .panel-handle {
        width: 36px;
        height: 4px;
        border-radius: 2px;
        margin: 0 auto 16px;
        background: #ddd;
      }
      #__main_whitelist_panel__ .panel-header, #__main_history_panel__ .panel-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 12px;
        font-size: 16px;
        font-weight: 600;
      }
      #__main_whitelist_panel__ .panel-close, #__main_history_panel__ .panel-close {
        background: none;
        border: none;
        font-size: 22px;
        cursor: pointer;
        opacity: 0.5;
        padding: 0 6px;
      }
      #__main_whitelist_panel__ .panel-list-wrap, #__main_history_panel__ .panel-list-wrap {
        position: relative;
        flex: 1;
        overflow: hidden;
        min-height: 0;
      }
      #__main_whitelist_panel__ .panel-list, #__main_history_panel__ .panel-list {
        height: 100%;
        max-height: 55vh;
        overflow-y: auto;
        padding: 4px 0;
        scroll-behavior: smooth;
      }
      #__main_whitelist_panel__ .panel-item, #__main_history_panel__ .panel-item {
        padding: 10px 6px;
        border-bottom: 1px solid rgba(128,128,128,0.15);
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 14px;
        cursor: default;
      }
      #__main_whitelist_panel__ .panel-item .item-main, #__main_history_panel__ .panel-item .item-main {
        flex: 1;
        display: flex;
        justify-content: space-between;
        align-items: center;
        overflow: hidden;
        cursor: pointer;
      }
      #__main_whitelist_panel__ .panel-item .item-main:active, #__main_history_panel__ .panel-item .item-main:active {
        opacity: 0.6;
      }
      #__main_whitelist_panel__ .panel-item .item-title, #__main_history_panel__ .panel-item .item-title {
        flex: 1;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        margin-right: 8px;
      }
      #__main_whitelist_panel__ .panel-item .item-del, #__main_history_panel__ .panel-item .item-del {
        background: none;
        border: none;
        font-size: 16px;
        cursor: pointer;
        opacity: 0.3;
        padding: 0 4px;
        color: inherit;
        line-height: 1;
      }
      #__main_whitelist_panel__ .panel-item .item-del:hover, #__main_history_panel__ .panel-item .item-del:hover {
        opacity: 0.9;
      }
      #__main_whitelist_panel__ .panel-empty, #__main_history_panel__ .panel-empty {
        padding: 30px 20px;
        text-align: center;
        opacity: 0.4;
        font-size: 13px;
      }
      #__main_whitelist_panel__ .fade-mask, #__main_history_panel__ .fade-mask {
        position: absolute;
        left: 0;
        right: 0;
        height: 24px;
        pointer-events: none;
        z-index: 2;
        transition: opacity 0.2s;
      }
      #__main_whitelist_panel__ .fade-mask.top, #__main_history_panel__ .fade-mask.top {
        top: 0;
        background: linear-gradient(to bottom, #fff, transparent);
      }
      #__main_whitelist_panel__ .fade-mask.bottom, #__main_history_panel__ .fade-mask.bottom {
        bottom: 0;
        background: linear-gradient(to top, #fff, transparent);
      }
      #__main_whitelist_panel__ .fade-mask.hidden, #__main_history_panel__ .fade-mask.hidden {
        opacity: 0;
      }
    `;
    document.head.appendChild(style);
  }

  function createHomepageButtons() {
    if (document.getElementById('__main_whitelist_btn__')) return;
    if (!host || !inWhitelist(host)) return;
    if (pathDepth(location.pathname) !== 0) return;
    if (state.open) return;

    injectMainPanelStyles();

    function createRoundButton(id, titleAttr, svgHtml) {
      var btn = document.createElement('div');
      btn.id = id;
      btn.style.cssText = 'width:56px;height:56px;border-radius:50%;background:#2c3e50;box-shadow:0 2px 12px rgba(0,0,0,0.3);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform 0.2s;';
      btn.innerHTML = svgHtml;
      btn.title = titleAttr;
      btn.addEventListener('mouseenter', function () { this.style.transform = 'scale(1.1)'; });
      btn.addEventListener('mouseleave', function () { this.style.transform = 'scale(1)'; });
      return btn;
    }

    function createMainPanel(id, titleText, closeId, fadeTopId, fadeBottomId, listId, emptyText) {
      var panel = document.createElement('div');
      panel.id = id;
      panel.className = 'panel-extra';
      panel.style.display = 'none';
      panel.style.zIndex = '10000';
      panel.style.maxHeight = '70vh';
      panel.style.background = '#fff';
      panel.innerHTML =
        '<div class="panel-handle"></div>' +
        '<div class="panel-header"><span>' + titleText + '</span><button class="panel-close" id="' + closeId + '">✕</button></div>' +
        '<div class="panel-list-wrap">' +
          '<div class="fade-mask top hidden" id="' + fadeTopId + '"></div>' +
          '<div class="panel-list" id="' + listId + '"><div class="panel-empty">' + emptyText + '</div></div>' +
          '<div class="fade-mask bottom hidden" id="' + fadeBottomId + '"></div>' +
        '</div>';
      document.body.appendChild(panel);
      return panel;
    }

    var container = document.createElement('div');
    container.id = '__main_buttons_container__';
    container.style.cssText = 'position:fixed;bottom:30px;right:20px;z-index:9999;display:flex;flex-direction:column;gap:10px;align-items:center;';

    var btnW = createRoundButton('__main_whitelist_btn__', '白名单', '<svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/><polyline points="9 12 11 14 15 10"/></svg>');
    var btnH = createRoundButton('__main_history_btn__', '阅读历史', '<svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>');
    container.appendChild(btnW);
    container.appendChild(btnH);
    document.body.appendChild(container);

    var panelW = createMainPanel('__main_whitelist_panel__', '白名单网站', '__main_whitelist_close__', '__main_wl_fade_top__', '__main_wl_fade_bottom__', '__main_whitelist_list__', '暂无白名单');
    var panelH = createMainPanel('__main_history_panel__', '阅读历史', '__main_history_close__', '__main_hist_fade_top__', '__main_hist_fade_bottom__', '__main_history_list__', '暂无历史记录');

    function setupMainFade(listId, topId, bottomId) {
      var list = document.getElementById(listId);
      var topMask = document.getElementById(topId);
      var bottomMask = document.getElementById(bottomId);
      if (!list || !topMask || !bottomMask) return;
      function check() {
        var st = list.scrollTop;
        var ms = list.scrollHeight - list.clientHeight;
        topMask.classList.toggle('hidden', st <= 2);
        bottomMask.classList.toggle('hidden', ms - st <= 2);
      }
      list.addEventListener('scroll', check);
      setTimeout(check, 50);
    }

    function renderMainList(listId, emptyText, rows, attrName, fadeTopId, fadeBottomId, onNavigate, onDelete) {
      var listEl = document.getElementById(listId);
      if (!listEl) return;
      if (!rows.length) {
        listEl.innerHTML = '<div class="panel-empty">' + emptyText + '</div>';
        return;
      }
      var html = '';
      rows.forEach(function (row) {
        var styleAttr = row.hi ? ' style="background-color:#e8f0fe;"' : '';
        html += '<div class="panel-item' + (row.hi ? ' panel-item-hi' : '') + '"' + styleAttr + '>' +
          '<div class="item-main" ' + attrName + '="' + row.key + '">' +
            '<span class="item-title">' + row.title + '</span>' +
          '</div>' +
          '<button class="item-del" ' + attrName + '="' + row.key + '">✕</button>' +
        '</div>';
      });
      listEl.innerHTML = html;
      listEl.querySelectorAll('.item-main').forEach(function (el) {
        el.addEventListener('click', function () {
          var val = this.getAttribute(attrName);
          if (val) onNavigate(val);
        });
      });
      listEl.querySelectorAll('.item-del').forEach(function (el) {
        el.addEventListener('click', function (ev) {
          ev.stopPropagation();
          var val = this.getAttribute(attrName);
          if (val) onDelete(val);
        });
      });
      setupMainFade(listId, fadeTopId, fadeBottomId);
    }

    function renderMainWhitelist() {
      var currentHost = window.location.hostname;
      var rows = getWhitelist().map(function (item) {
        return { title: item.title || item.domain, key: item.domain, hi: item.domain === currentHost };
      });
      renderMainList('__main_whitelist_list__', '暂无白名单', rows, 'data-domain', '__main_wl_fade_top__', '__main_wl_fade_bottom__',
        function (d) { window.location.href = 'https://' + d; },
        function (d) {
          var list2 = getWhitelist().filter(function (item) { return item.domain !== d; });
          saveWhitelist(list2);
          renderMainWhitelist();
          toast('已删除：' + d);
        });
      // 当前网站高亮项自动滚动到可视区域，避免被挤在列表底部
      var hiEl = document.getElementById('__main_whitelist_list__').querySelector('.panel-item-hi');
      if (hiEl) {
        try { hiEl.scrollIntoView({ block: 'center' }); } catch (e) { hiEl.scrollIntoView(); }
      }
    }

    function renderMainHistory() {
      var sorted = getHistory().slice().sort(function (a, b) { return b.timestamp - a.timestamp; });
      var currentBookKey = getBookRootKey(window.location.href);
      var rows = sorted.map(function (entry) {
        var entryKey = entry.bookKey || getBookRootKey(entry.url);
        return { title: entry.title || '未命名', key: entry.url, hi: entryKey === currentBookKey };
      });
      renderMainList('__main_history_list__', '暂无历史记录', rows, 'data-url', '__main_hist_fade_top__', '__main_hist_fade_bottom__',
        function (u) { window.location.href = u; },
        function (u) {
          var oldH = getHistory();
          var rk = '';
          for (var i = 0; i < oldH.length; i++) {
            if (oldH[i].url === u) { rk = oldH[i].bookKey || getBookRootKey(oldH[i].url); break; }
          }
          var h2 = oldH.filter(function (item) { return item.url !== u; });
          saveHistory(h2);
          if (rk) removeTocCacheForBook(rk);
          renderMainHistory();
          toast('已删除');
        });
    }

    var mask = null;
    var currentPanel = null;
    function hidePanelsNow() {
      panelW.style.display = 'none';
      panelH.style.display = 'none';
      panelW.classList.remove('visible');
      panelH.classList.remove('visible');
      if (mask) { mask.remove(); mask = null; }
      currentPanel = null;
    }

    function togglePanel(type) {
      if (!mask) {
        mask = document.createElement('div');
        mask.id = '__main_panel_mask__';
        mask.style.cssText = 'position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999;background:rgba(0,0,0,0.3);';
        mask.addEventListener('click', hidePanelsNow);
        document.body.appendChild(mask);
      }

      if (currentPanel === type) { hidePanelsNow(); return; }

      panelW.style.display = 'none';
      panelH.style.display = 'none';
      panelW.classList.remove('visible');
      panelH.classList.remove('visible');

      var targetPanel = (type === 'whitelist') ? panelW : panelH;
      if (type === 'whitelist') renderMainWhitelist(); else renderMainHistory();
      targetPanel.style.display = 'block';
      setTimeout(function () { targetPanel.classList.add('visible'); }, 10);
      currentPanel = type;

      var closeBtn = targetPanel.querySelector('.panel-close');
      if (closeBtn) closeBtn.onclick = hidePanelsNow;
    }

    btnW.addEventListener('click', function (ev) { ev.stopPropagation(); togglePanel('whitelist'); });
    btnH.addEventListener('click', function (ev) { ev.stopPropagation(); togglePanel('history'); });
  }

  if (host && inWhitelist(host)) {
    setTimeout(function() {
      try {
        if (pathDepth(location.pathname) === 0 && !state.open) {
          createHomepageButtons();
        }
      } catch(e) {}
    }, 800);
  }

  /* ==================== 白名单域名自动进入 ==================== */
  if (host && inWhitelist(host)) {
    var suppressed = false;
    try { suppressed = sessionStorage.getItem('__novel_reader_exit__') === location.href; } catch (e) {}
    if (!suppressed) {
      setTimeout(function () {
        try {
          if (state.open) return;
          var depth = pathDepth(location.pathname);
          var novelLike = looksLikeNovelPage();
          if (depth < 2 && !novelLike) return;
          var readerable = false;
          try { readerable = Readability.isProbablyReaderable(document, { minScore: 20, minContentLength: 100 }); } catch (e) {}
          if (novelLike || readerable || isComicPage(document)) openReader();
        } catch (e) {}
      }, 500);
    }
  }
})();